- mail.google.com</pre>
- </td>
- </tr>
- </table>
- <p>Be sure to flush your browser's caches whenever making these kinds
- of changes, just to make sure the changes <span class=
- "QUOTE">"take"</span>.</p>
- <p>Make sure the domain, host and path are appropriate as well. Your
- browser can tell you where you are specifically and you should use that
- information for your configuration settings. Note that above it is not
- referenced as <tt class="LITERAL">gmail.com</tt>, which is a valid
- domain name.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="CONFIGFILES" id="CONFIGFILES">3.9. What's
- the difference between the <span class="QUOTE">"Cautious"</span>,
- <span class="QUOTE">"Medium"</span> and <span class=
- "QUOTE">"Advanced"</span> defaults?</a></h3>
- <p>Configuring <span class="APPLICATION">Privoxy</span> is not entirely
- trivial. To help you get started, we provide you with three different
- default action <span class="QUOTE">"profiles"</span> in the web based
- actions file editor at <a href="http://config.privoxy.org/show-status"
- target="_top">http://config.privoxy.org/show-status</a>. See the
- <a href="../user-manual/actions-file.html" target="_top"><i class=
- "CITETITLE">User Manual</i></a> for a list of actions, and how the
- default profiles are set.</p>
- <p>Where the defaults are likely to break some sites, exceptions for
- known popular <span class="QUOTE">"problem"</span> sites are included,
- but in general, the more aggressive your default settings are, the more
- exceptions you will have to make later. New users are best to start off
- in <span class="QUOTE">"Cautious"</span> setting. This is safest and
- will have the fewest problems. See the <a href=
- "../user-manual/index.html" target="_top"><i class="CITETITLE">User
- Manual</i></a> for a more detailed discussion.</p>
- <p>It should be noted that the <span class="QUOTE">"Advanced"</span>
- profile (formerly known as the <span class=
- "QUOTE">"Adventuresome"</span> profile) is more aggressive, and will
- make use of some of <span class="APPLICATION">Privoxy's</span> advanced
- features. Use at your own risk!</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="BROWSECONFIG" id="BROWSECONFIG">3.10. Why
- can I change the configuration with a browser? Does that not raise
- security issues?</a></h3>
- <p>It may seem strange that regular users can edit the config files
- with their browsers, although the whole <tt class=
- "FILENAME">/etc/privoxy</tt> hierarchy belongs to the user <span class=
- "QUOTE">"privoxy"</span>, with only 644 permissions.</p>
- <p>When you use the browser-based editor, <span class=
- "APPLICATION">Privoxy</span> itself is writing to the config files.
- Because <span class="APPLICATION">Privoxy</span> is running as the user
- <span class="QUOTE">"privoxy"</span>, it can update its own config
- files.</p>
- <p>If you run <span class="APPLICATION">Privoxy</span> for multiple
- untrusted users (e.g. in a LAN) or aren't entirely in control of your
- own browser, you will probably want to make sure that the web-based
- editor and remote toggle features are <span class="QUOTE">"off"</span>
- by setting <span class="QUOTE">"<tt class="LITERAL"><a href=
- "../user-manual/config.html#ENABLE-EDIT-ACTIONS" target=
- "_top">enable-edit-actions</a> 0</tt>"</span> and <span class=
- "QUOTE">"<tt class="LITERAL"><a href=
- "../user-manual/config.html#ENABLE-REMOTE-TOGGLE" target=
- "_top">enable-remote-toggle</a> 0</tt>"</span> in the <a href=
- "../user-manual/config.html" target="_top">main configuration
- file</a>.</p>
- <p>As of <span class="APPLICATION">Privoxy</span> 3.0.7 these options
- are disabled by default.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="FILTERFILE" id="FILTERFILE">3.11. What is
- the <tt class="FILENAME">default.filter</tt> file? What is a
- <span class="QUOTE">"filter"</span>?</a></h3>
- <p>The <a href="../user-manual/filter-file.html" target=
- "_top"><tt class="FILENAME">default.filter</tt></a> file is where
- <span class="emphasis"><i class="EMPHASIS">filters</i></span> as
- supplied by the developers are defined. Filters are a special subset of
- actions that can be used to modify or remove web page content or
- headers on the fly. Content filters can be applied to <span class=
- "emphasis"><i class="EMPHASIS">anything</i></span> in the page source,
- header filters can be applied to either server or client headers.
- Regular expressions are used to accomplish this.</p>
- <p>There are a number of pre-defined filters to deal with common
- annoyances. The filters are only defined here, to invoke them, you need
- to use the <a href="../user-manual/actions-file.html#FILTER" target=
- "_top"><tt class="LITERAL">filter</tt> action</a> in one of the actions
- files. Content filtering is automatically disabled for inappropriate
- MIME types, but if you know better than Privoxy what should or should
- not be filtered you can filter any content you like.</p>
- <p>Filters should <span class="emphasis"><i class=
- "EMPHASIS">not</i></span> be confused with <a href=
- "../user-manual/actions-file.html#BLOCK" target="_top"><tt class=
- "LITERAL">blocks</tt></a>, which is a completely different action, and
- is more typically used to block ads and unwanted sites.</p>
- <p>If you are familiar with regular expressions, and HTML, you can look
- at the provided <tt class="FILENAME">default.filter</tt> with a text
- editor and define your own filters. This is potentially a very powerful
- feature, but requires some expertise in both regular expressions and
- HTML/HTTP. You should place any modifications to the default filters,
- or any new ones you create in a separate file, such as <tt class=
- "FILENAME">user.filter</tt>, so they won't be overwritten during
- upgrades. The ability to define multiple filter files in <tt class=
- "FILENAME">config</tt> is a new feature as of v. 3.0.5.</p>
- <p>There is no GUI editor option for this part of the configuration,
- but you can disable/enable the various pre-defined filters of the
- included <tt class="FILENAME">default.filter</tt> file with the
- <a href="http://config.privoxy.org/show-status" target="_top">web-based
- actions file editor</a>. Note that the custom actions editor must be
- explicitly enabled in the main config file (see <a href=
- "../user-manual/config.html#ENABLE-EDIT-ACTIONS" target=
- "_top">enable-edit-actions</a>).</p>
- <p>If you intend to develop your own filters, you might want to have a
- look at <a href="https://www.fabiankeil.de/sourcecode/pft/" target=
- "_top">Privoxy-Filter-Test</a>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="LANCONFIG" id="LANCONFIG">3.12. How can I
- set up Privoxy to act as a proxy for my LAN?</a></h3>
- <p>By default, <span class="APPLICATION">Privoxy</span> only responds
- to requests from <tt class="LITERAL">127.0.0.1</tt> (localhost). To
- have it act as a server for a network, this needs to be changed in the
- <a href="../user-manual/config.html" target="_top">main configuration
- file</a>. Look for the <tt class="LITERAL"><a href=
- "../user-manual/config.html#LISTEN-ADDRESS" target=
- "_top">listen-address</a></tt> option, which may be commented out with
- a <span class="QUOTE">"#"</span> symbol. Make sure it is uncommented,
- and assign it the address of the LAN gateway interface, and port number
- to use. Assuming your LAN address is 192.168.1.1 and you wish to run
- <span class="APPLICATION">Privoxy</span> on port 8118, this line should
- look like:</p>
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN"> listen-address 192.168.1.1:8118</pre>
- </td>
- </tr>
- </table>
- <p>Save the file, and restart <span class="APPLICATION">Privoxy</span>.
- Configure all browsers on the network then to use this address and port
- number.</p>
- <p>Alternately, you can have <span class="APPLICATION">Privoxy</span>
- listen on all available interfaces:</p>
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN"> listen-address :8118</pre>
- </td>
- </tr>
- </table>
- <p>And then use <span class="APPLICATION">Privoxy's</span> <a href=
- "../user-manual/config.html#PERMIT-ACCESS" target=
- "_top">permit-access</a> feature to limit connections. A firewall in
- this situation is recommended as well.</p>
- <p>The above steps should be the same for any TCP network, regardless
- of operating system.</p>
- <p>If you run <span class="APPLICATION">Privoxy</span> on a LAN with
- untrusted users, we recommend that you double-check the <a href=
- "../user-manual/config.html#ACCESS-CONTROL" target="_top">access
- control and security</a> options!</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="NOSEEUM" id="NOSEEUM">3.13. Instead of ads,
- now I get a checkerboard pattern. I don't want to see
- anything.</a></h3>
- <p>The replacement for blocked images can be controlled with the
- <a href="../user-manual/actions-file.html#SET-IMAGE-BLOCKER" target=
- "_top"><tt class="LITERAL">set-image-blocker</tt> action</a>. You have
- the choice of a checkerboard pattern, a transparent 1x1 GIF image (aka
- <span class="QUOTE">"blank"</span>), or a redirect to a custom image of
- your choice. Note that this choice only has effect for images which are
- blocked as images, i.e. whose URLs match both a <tt class=
- "LITERAL"><a href="../user-manual/actions-file.html#HANDLE-AS-IMAGE"
- target="_top">handle-as-image</a></tt> <span class="emphasis"><i class=
- "EMPHASIS">and</i></span> <tt class="LITERAL"><a href=
- "../user-manual/actions-file.html#BLOCK" target="_top">block</a></tt>
- action.</p>
- <p>If you want to see nothing, then change the <a href=
- "../user-manual/actions-file.html#SET-IMAGE-BLOCKER" target=
- "_top"><tt class="LITERAL">set-image-blocker</tt> action</a> to
- <span class="QUOTE">"blank"</span>. This can be done by editing the
- <tt class="FILENAME">user.action</tt> file, or through the <a href=
- "http://config.privoxy.org/show-status" target="_top">web-based actions
- file editor</a>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="WHYSEEUM" id="WHYSEEUM">3.14. Why would
- anybody want to see a checkerboard pattern?</a></h3>
- <p>Remember that <a href="general.html#WHATSANAD">telling which image
- is an ad and which isn't</a>, is an educated guess. While we hope that
- the standard configuration is rather smart, it will make occasional
- mistakes. The checkerboard image is visually decent, and it shows you
- where images have been blocked, which can be very helpful in case some
- navigation aid or otherwise innocent image was erroneously blocked. It
- is recommended for new users so they can <span class=
- "QUOTE">"see"</span> what is happening. Some people might also enjoy
- seeing how many banners they <span class="emphasis"><i class=
- "EMPHASIS">don't</i></span> have to see.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="BLOCKEDBYTEXT" id="BLOCKEDBYTEXT">3.15. I
- see some images being replaced with text instead of the checkerboard
- image. Why and how do I get rid of this?</a></h3>
- <p>This happens when the banners are not embedded in the HTML code of
- the page itself, but in separate HTML (sub)documents that are loaded
- into (i)frames or (i)layers, and these external HTML documents are
- blocked. Being non-images they get replaced by a substitute HTML page
- rather than a substitute image, which wouldn't work out technically,
- since the browser expects and accepts only HTML when it has requested
- an HTML document.</p>
- <p>The substitute page adapts to the available space and shows itself
- as a miniature two-liner if loaded into small frames, or full-blown
- with a large red "BLOCKED" banner if space allows.</p>
- <p>If you prefer the banners to be blocked by images, you must see to
- it that the HTML documents in which they are embedded are not blocked.
- Clicking the <span class="QUOTE">"See why"</span> link offered in the
- substitute page will show you which rule blocked the page. After
- changing the rule and un-blocking the HTML documents, the browser will
- try to load the actual banner images and the usual image blocking will
- (hopefully!) kick in.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="SRVANY" id="SRVANY">3.16. Can Privoxy run as
- a service on Win2K/NT/XP?</a></h3>
- <p>Yes. Version 3.0.5 introduces full <span class=
- "APPLICATION">Windows</span> service functionality. See <a href=
- "../user-manual/installation.html#installation-pack-win" target=
- "_top">the <i class="CITETITLE">User Manual</i></a> for details on how
- to install and configure <span class="APPLICATION">Privoxy</span> as a
- service.</p>
- <p>Earlier 3.x versions could run as a system service using <b class=
- "COMMAND">srvany.exe</b>. See the discussion at <a href=
- "https://sourceforge.net/tracker/?func=detail&atid=361118&aid=485617&group_id=11118"
- target=
- "_top">https://sourceforge.net/tracker/?func=detail&atid=361118&aid=485617&group_id=11118</a>,
- for details, and a sample configuration.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="OTHERPROXY" id="OTHERPROXY">3.17. How can I
- make Privoxy work with other proxies?</a></h3>
- <p>This can be done and is often useful to combine the benefits of
- <span class="APPLICATION">Privoxy</span> with those of a another proxy,
- for example to cache content. See the <a href=
- "../user-manual/config.html#FORWARDING" target="_top">forwarding
- chapter</a> in the <a href="../user-manual/index.html" target=
- "_top">User Manual</a> which describes how to do this. If you intend to
- use Privoxy with Tor, please also have a look at <a href=
- "misc.html#TOR">How do I use Privoxy together with Tor</a>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="PORT-80" id="PORT-80">3.18. Can I just set
- Privoxy to use port 80 and thus avoid individual browser
- configuration?</a></h3>
- <p>No, its more complicated than that. This only works with special
- kinds of proxies known as <span class="QUOTE">"intercepting"</span>
- proxies (<a href="configuration.html#INTERCEPTING">see below</a>).</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="TRANSPARENT" id="TRANSPARENT">3.19. Can
- Privoxy run as a <span class="QUOTE">"transparent"</span>
- proxy?</a></h3>
- <p>The whole idea of Privoxy is to modify client requests and server
- responses in all sorts of ways and therefore it's not a transparent
- proxy as described in <a href="http://tools.ietf.org/html/rfc2616"
- target="_top">RFC 2616</a>.</p>
- <p>However, some people say <span class="QUOTE">"transparent
- proxy"</span> when they mean <span class="QUOTE">"intercepting
- proxy"</span>. If you are one of them, please read the <a href=
- "configuration.html#INTERCEPTING">next entry</a>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="INTERCEPTING" id="INTERCEPTING">3.20. Can
- Privoxy run as a <span class="QUOTE">"intercepting"</span>
- proxy?</a></h3>
- <p><span class="APPLICATION">Privoxy</span> can't intercept traffic
- itself, but it can handle requests that where intercepted and
- redirected with a packet filter (like <span class=
- "APPLICATION">PF</span> or <span class="APPLICATION">iptables</span>),
- as long as the <tt class="LITERAL">Host</tt> header is present.</p>
- <p>As the <tt class="LITERAL">Host</tt> header is required by HTTP/1.1
- and as most web sites rely on it anyway, this limitation shouldn't be a
- problem.</p>
- <p>Please refer to your packet filter's documentation to learn how to
- intercept and redirect traffic into <span class=
- "APPLICATION">Privoxy</span>. Afterward you just have to configure
- <span class="APPLICATION">Privoxy</span> to <a href=
- "../user-manual/config.html#ACCEPT-INTERCEPTED-REQUESTS" target=
- "_top">accept intercepted requests</a>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="OUTLOOK" id="OUTLOOK">3.21. How can I
- configure Privoxy for use with Outlook?</a></h3>
- <p>Versions of <span class="APPLICATION">Outlook</span> prior to Office
- 2007, use <span class="APPLICATION">Internet Explorer</span> components
- to both render HTML, and fetch any HTTP requests that may be embedded
- in an HTML email. So however you have <span class=
- "APPLICATION">Privoxy</span> configured to work with IE, this
- configuration should automatically be shared, at least with older
- version of Internet Explorer.</p>
- <p>Starting with Office 2007, Microsoft is instead using the MS-Word
- rendering engine with Outlook. It is unknown whether this can be
- configured to use a proxy.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="OUTLOOK-MORE" id="OUTLOOK-MORE">3.22. How
- can I have separate rules just for HTML mail?</a></h3>
- <p>The short answer is, you can't. <span class=
- "APPLICATION">Privoxy</span> has no way of knowing which particular
- application makes a request, so there is no way to distinguish between
- web pages and HTML mail. <span class="APPLICATION">Privoxy</span> just
- blindly proxies all requests. In the case of <span class=
- "APPLICATION">Outlook Express</span> (see above), OE uses IE anyway,
- and there is no way for <span class="APPLICATION">Privoxy</span> to
- ever be able to distinguish between them (nor could any other proxy
- type application for that matter).</p>
- <p>For a good discussion of some of the issues involved (including
- privacy and security issues), see <a href=
- "https://sourceforge.net/tracker/?func=detail&atid=211118&aid=629518&group_id=11118"
- target=
- "_top">https://sourceforge.net/tracker/?func=detail&atid=211118&aid=629518&group_id=11118</a>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="SNEAKY-COOKIES" id="SNEAKY-COOKIES">3.23. I
- sometimes notice cookies sneaking through. How?</a></h3>
- <p><a href="http://en.wikipedia.org/wiki/Browser_cookie" target=
- "_top">Cookies</a> can be set in several ways. The classic method is
- via the <tt class="LITERAL">Set-Cookie</tt> HTTP header. This is
- straightforward, and an easy one to manipulate, such as the
- <span class="APPLICATION">Privoxy</span> concept of <a href=
- "../user-manual/actions-file.html#SESSION-COOKIES-ONLY" target=
- "_top">session-cookies-only</a>. There is also the possibility of using
- <a href="http://en.wikipedia.org/wiki/Javascript" target=
- "_top">Javascript</a> to set cookies (<span class=
- "APPLICATION">Privoxy</span> calls these <tt class=
- "LITERAL">content-cookies</tt>). This is trickier because the syntax
- can vary widely, and thus requires a certain amount of guesswork. It is
- not realistic to catch all of these short of disabling Javascript,
- which would break many sites. And lastly, if the cookies are embedded
- in a HTTPS/SSL secure session via Javascript, they are beyond
- <span class="APPLICATION">Privoxy's</span> reach.</p>
- <p>All in all, <span class="APPLICATION">Privoxy</span> can help manage
- cookies in general, can help minimize the loss of privacy posed by
- cookies, but can't realistically stop all cookies.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="EVIL-COOKIES" id="EVIL-COOKIES">3.24. Are
- all cookies bad? Why?</a></h3>
- <p>No, in fact there are many beneficial uses of <a href=
- "http://en.wikipedia.org/wiki/Browser_cookie" target=
- "_top">cookies</a>. Cookies are just a method that browsers can use to
- store data between pages, or between browser sessions. Sometimes there
- is a good reason for this, and the user's life is a bit easier as a
- result. But there is a long history of some websites taking advantage
- of this layer of trust, and using the data they glean from you and your
- browsing habits for their own purposes, and maybe to your potential
- detriment. Such sites are using you and storing their data on your
- system. That is why the privacy conscious watch from whom those cookies
- come, and why they really <span class="emphasis"><i class=
- "EMPHASIS">need</i></span> to be there.</p>
- <p>See the <a href="http://en.wikipedia.org/wiki/Browser_cookie"
- target="_top">Wikipedia cookie definition</a> for more.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="ALLOW-COOKIES" id="ALLOW-COOKIES">3.25. How
- can I allow permanent cookies for my trusted sites?</a></h3>
- <p>There are several actions that relate to cookies. The default
- behavior is to allow only <span class="QUOTE">"session cookies"</span>,
- which means the cookies only last for the current browser session. This
- eliminates most kinds of abuse related to cookies. But there may be
- cases where you want cookies to last.</p>
- <p>To disable all cookie actions, so that cookies are allowed
- unrestricted, both in and out, for <tt class=
- "LITERAL">example.com</tt>:</p>
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
- { -crunch-incoming-cookies -crunch-outgoing-cookies -session-cookies-only -filter{content-cookies} }
- .example.com</pre>
- </td>
- </tr>
- </table>
- <p>Place the above in <tt class="FILENAME">user.action</tt>. Note that
- some of these may be off by default anyway, so this might be redundant,
- but there is no harm being explicit in what you want to happen.
- <tt class="FILENAME">user.action</tt> includes an alias for this
- situation, called <tt class="LITERAL">allow-all-cookies</tt>.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="MULTIPLES" id="MULTIPLES">3.26. Can I have
- separate configurations for different users?</a></h3>
- <p>Each instance of <span class="APPLICATION">Privoxy</span> has its
- own configuration, including such attributes as the TCP port that it
- listens on. What you can do is run multiple instances of <span class=
- "APPLICATION">Privoxy</span>, each with a unique <a href=
- "../user-manual/config.html#LISTEN-ADDRESS" target=
- "_top">listen-address</a> configuration setting, and configuration
- path, and then each of these can have their own configurations. Think
- of it as per-port configuration.</p>
- <p>Simple enough for a few users, but for large installations, consider
- having groups of users that might share like configurations.</p>
- </div>
- <div class="SECT2">
- <h3 class="SECT2"><a name="WHITELISTS" id="WHITELISTS">3.27. Can I
- set-up Privoxy as a whitelist of <span class="QUOTE">"good"</span>
- sites?</a></h3>
- <p>Sure. There are a couple of things you can do for simple
- white-listing. Here's one real easy one:</p>
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
- ############################################################
+ mail.google.com</PRE
+></TD
+></TR
+></TABLE
+><P
+> Be sure to flush your browser's caches whenever making these kinds of
+ changes, just to make sure the changes <SPAN
+CLASS="QUOTE"
+>"take"</SPAN
+>.
+ </P
+><P
+> Make sure the domain, host and path are appropriate as well. Your browser can
+ tell you where you are specifically and you should use that information for
+ your configuration settings. Note that above it is not referenced as
+ <TT
+CLASS="LITERAL"
+>gmail.com</TT
+>, which is a valid domain name.
+ </P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="CONFIGFILES"
+>3.9. What's the difference between the
+<SPAN
+CLASS="QUOTE"
+>"Cautious"</SPAN
+>, <SPAN
+CLASS="QUOTE"
+>"Medium"</SPAN
+> and <SPAN
+CLASS="QUOTE"
+>"Advanced"</SPAN
+> defaults?</A
+></H3
+><P
+> Configuring <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> is not entirely trivial. To
+ help you get started, we provide you with three different default action
+ <SPAN
+CLASS="QUOTE"
+>"profiles"</SPAN
+> in the web based actions file editor at <A
+HREF="http://config.privoxy.org/show-status"
+TARGET="_top"
+>http://config.privoxy.org/show-status</A
+>.
+ See the <A
+HREF="../user-manual/actions-file.html"
+TARGET="_top"
+><I
+CLASS="CITETITLE"
+>User
+ Manual</I
+></A
+> for a list of actions, and how the default
+ profiles are set.
+ </P
+><P
+> Where the defaults are likely to break some sites, exceptions for
+ known popular <SPAN
+CLASS="QUOTE"
+>"problem"</SPAN
+> sites are included, but in
+ general, the more aggressive your default settings are, the more exceptions
+ you will have to make later. New users are best to start off in
+ <SPAN
+CLASS="QUOTE"
+>"Cautious"</SPAN
+> setting. This is safest and will have the fewest
+ problems. See the <A
+HREF="../user-manual/index.html"
+TARGET="_top"
+><I
+CLASS="CITETITLE"
+>User Manual</I
+></A
+>
+ for a more detailed discussion.</P
+><P
+> It should be noted that the <SPAN
+CLASS="QUOTE"
+>"Advanced"</SPAN
+> profile (formerly known
+ as the <SPAN
+CLASS="QUOTE"
+>"Adventuresome"</SPAN
+> profile) is more
+ aggressive, and will make use of some of
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+> advanced features. Use at your own risk!</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="BROWSECONFIG"
+>3.10. Why can I change the configuration
+with a browser? Does that not raise security issues?</A
+></H3
+><P
+> It may seem strange that regular users can edit the config files with their
+ browsers, although the whole <TT
+CLASS="FILENAME"
+>/etc/privoxy</TT
+> hierarchy
+ belongs to the user <SPAN
+CLASS="QUOTE"
+>"privoxy"</SPAN
+>, with only 644 permissions.
+ </P
+><P
+> When you use the browser-based editor, <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>
+ itself is writing to the config files. Because
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> is running as the user <SPAN
+CLASS="QUOTE"
+>"privoxy"</SPAN
+>,
+ it can update its own config files.
+ </P
+><P
+> If you run <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> for multiple untrusted users (e.g. in
+ a LAN) or aren't entirely in control of your own browser, you will probably want
+ to make sure that the web-based editor and remote toggle features are
+ <SPAN
+CLASS="QUOTE"
+>"off"</SPAN
+> by setting <SPAN
+CLASS="QUOTE"
+>"<TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/config.html#ENABLE-EDIT-ACTIONS"
+TARGET="_top"
+>enable-edit-actions</A
+>
+ 0</TT
+>"</SPAN
+> and <SPAN
+CLASS="QUOTE"
+>"<TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/config.html#ENABLE-REMOTE-TOGGLE"
+TARGET="_top"
+>enable-remote-toggle</A
+>
+ 0</TT
+>"</SPAN
+> in the <A
+HREF="../user-manual/config.html"
+TARGET="_top"
+>main configuration file</A
+>.
+ </P
+><P
+> As of <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> 3.0.7 these options are disabled by default.
+ </P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="FILTERFILE"
+>3.11. What is the <TT
+CLASS="FILENAME"
+>default.filter</TT
+> file? What is a <SPAN
+CLASS="QUOTE"
+>"filter"</SPAN
+>?</A
+></H3
+><P
+> The <A
+HREF="../user-manual/filter-file.html"
+TARGET="_top"
+><TT
+CLASS="FILENAME"
+>default.filter</TT
+></A
+>
+ file is where <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>filters</I
+></SPAN
+> as supplied by the developers are defined.
+ Filters are a special subset of actions that can be used to modify or
+ remove web page content or headers on the fly. Content filters can
+ be applied to <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>anything</I
+></SPAN
+> in the page source,
+ header filters can be applied to either server or client headers.
+ Regular expressions are used to accomplish this.</P
+><P
+> There are a number of pre-defined filters to deal with common annoyances. The
+ filters are only defined here, to invoke them, you need to use the
+ <A
+HREF="../user-manual/actions-file.html#FILTER"
+TARGET="_top"
+><TT
+CLASS="LITERAL"
+>filter</TT
+>
+ action</A
+> in one of the actions files. Content filtering is automatically
+ disabled for inappropriate MIME types, but if you know better than Privoxy
+ what should or should not be filtered you can filter any content you like.</P
+><P
+> Filters should
+ <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>not</I
+></SPAN
+> be confused with <A
+HREF="../user-manual/actions-file.html#BLOCK"
+TARGET="_top"
+><TT
+CLASS="LITERAL"
+>blocks</TT
+></A
+>, which
+ is a completely different action, and is more typically used to block ads and
+ unwanted sites.</P
+><P
+> If you are familiar with regular expressions, and HTML, you can look at
+ the provided <TT
+CLASS="FILENAME"
+>default.filter</TT
+> with a text editor and define
+ your own filters. This is potentially a very powerful feature, but
+ requires some expertise in both regular expressions and HTML/HTTP.
+ You should
+ place any modifications to the default filters, or any new ones you create
+ in a separate file, such as <TT
+CLASS="FILENAME"
+>user.filter</TT
+>, so they won't
+ be overwritten during upgrades.
+ The ability to define multiple filter files
+ in <TT
+CLASS="FILENAME"
+>config</TT
+> is a new feature as of v. 3.0.5.</P
+><P
+> There is no GUI editor option for this part of the configuration,
+ but you can disable/enable the various pre-defined filters of the included
+ <TT
+CLASS="FILENAME"
+>default.filter</TT
+> file with the <A
+HREF="http://config.privoxy.org/show-status"
+TARGET="_top"
+>web-based actions file editor</A
+>.
+ Note that the custom actions editor must be explicitly enabled in
+ the main config file (see <A
+HREF="../user-manual/config.html#ENABLE-EDIT-ACTIONS"
+TARGET="_top"
+>enable-edit-actions</A
+>).</P
+><P
+> If you intend to develop your own filters, you might want to have a look at
+ <A
+HREF="https://www.fabiankeil.de/sourcecode/pft/"
+TARGET="_top"
+>Privoxy-Filter-Test</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="LANCONFIG"
+>3.12. How can I set up Privoxy to act as a proxy for my
+ LAN?</A
+></H3
+><P
+> By default, <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> only responds to requests
+ from <TT
+CLASS="LITERAL"
+>127.0.0.1</TT
+> (localhost). To have it act as a server for
+ a network, this needs to be changed in the <A
+HREF="../user-manual/config.html"
+TARGET="_top"
+>main configuration file</A
+>. Look for
+ the <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/config.html#LISTEN-ADDRESS"
+TARGET="_top"
+>listen-address</A
+></TT
+>
+ option, which may be commented out with a <SPAN
+CLASS="QUOTE"
+>"#"</SPAN
+> symbol. Make sure
+ it is uncommented, and assign it the address of the LAN gateway interface,
+ and port number to use. Assuming your LAN address is 192.168.1.1 and you
+ wish to run <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> on port 8118, this line
+ should look like:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+> listen-address 192.168.1.1:8118</PRE
+></TD
+></TR
+></TABLE
+><P
+> Save the file, and restart <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>. Configure
+ all browsers on the network then to use this address and port number.</P
+><P
+> Alternately, you can have <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> listen on
+ all available interfaces:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+> listen-address :8118</PRE
+></TD
+></TR
+></TABLE
+><P
+> And then use <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+>
+ <A
+HREF="../user-manual/config.html#PERMIT-ACCESS"
+TARGET="_top"
+>permit-access</A
+>
+ feature to limit connections. A firewall in this situation is recommended
+ as well.</P
+><P
+> The above steps should be the same for any TCP network, regardless of
+ operating system.</P
+><P
+> If you run <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> on a LAN with untrusted users,
+ we recommend that you double-check the <A
+HREF="../user-manual/config.html#ACCESS-CONTROL"
+TARGET="_top"
+>access control and security</A
+>
+ options!</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="NOSEEUM"
+>3.13. Instead of ads, now I get a checkerboard pattern. I don't want to see anything.</A
+></H3
+><P
+> The replacement for blocked images can be controlled with the <A
+HREF="../user-manual/actions-file.html#SET-IMAGE-BLOCKER"
+TARGET="_top"
+><TT
+CLASS="LITERAL"
+>set-image-blocker</TT
+>
+ action</A
+>. You have the choice of a checkerboard pattern, a transparent 1x1 GIF
+ image (aka <SPAN
+CLASS="QUOTE"
+>"blank"</SPAN
+>), or a redirect to a custom image of your choice.
+ Note that this choice only has effect for images which are blocked as images, i.e.
+ whose URLs match both a <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#HANDLE-AS-IMAGE"
+TARGET="_top"
+>handle-as-image</A
+></TT
+>
+ <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>and</I
+></SPAN
+> <TT
+CLASS="LITERAL"
+><A
+HREF="../user-manual/actions-file.html#BLOCK"
+TARGET="_top"
+>block</A
+></TT
+> action.</P
+><P
+> If you want to see nothing, then change the <A
+HREF="../user-manual/actions-file.html#SET-IMAGE-BLOCKER"
+TARGET="_top"
+><TT
+CLASS="LITERAL"
+>set-image-blocker</TT
+>
+ action</A
+> to <SPAN
+CLASS="QUOTE"
+>"blank"</SPAN
+>. This can be done by editing the
+ <TT
+CLASS="FILENAME"
+>user.action</TT
+> file, or through the <A
+HREF="http://config.privoxy.org/show-status"
+TARGET="_top"
+>web-based actions file editor</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="WHYSEEUM"
+>3.14. Why would anybody want to see a checkerboard pattern?</A
+></H3
+><P
+> Remember that <A
+HREF="general.html#WHATSANAD"
+>telling which image is an ad and which
+ isn't</A
+>, is an educated guess. While we hope that the standard configuration
+ is rather smart, it will make occasional mistakes. The checkerboard image is visually
+ decent, and it shows you where images have been blocked, which can be very
+ helpful in case some navigation aid or otherwise innocent image was
+ erroneously blocked. It is recommended for new users so they can
+ <SPAN
+CLASS="QUOTE"
+>"see"</SPAN
+> what is happening. Some people might also enjoy seeing how
+ many banners they <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>don't</I
+></SPAN
+> have to see.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="BLOCKEDBYTEXT"
+>3.15. I see some images being replaced with text
+instead of the checkerboard image. Why and how do I get rid of this?</A
+></H3
+><P
+> This happens when the banners are not embedded in the HTML code of the
+ page itself, but in separate HTML (sub)documents that are loaded into (i)frames
+ or (i)layers, and these external HTML documents are blocked. Being non-images
+ they get replaced by a substitute HTML page rather than a substitute image,
+ which wouldn't work out technically, since the browser expects and accepts
+ only HTML when it has requested an HTML document.</P
+><P
+> The substitute page adapts to the available space and shows itself as a
+ miniature two-liner if loaded into small frames, or full-blown with a
+ large red "BLOCKED" banner if space allows.</P
+><P
+> If you prefer the banners to be blocked by images, you must see to it that
+ the HTML documents in which they are embedded are not blocked. Clicking
+ the <SPAN
+CLASS="QUOTE"
+>"See why"</SPAN
+> link offered in the substitute page will show
+ you which rule blocked the page. After changing the rule and un-blocking
+ the HTML documents, the browser will try to load the actual banner images
+ and the usual image blocking will (hopefully!) kick in.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SRVANY"
+>3.16. Can Privoxy run as a service
+on Win2K/NT/XP?</A
+></H3
+><P
+> Yes. Version 3.0.5 introduces full <SPAN
+CLASS="APPLICATION"
+>Windows</SPAN
+> service
+ functionality. See <A
+HREF="../user-manual/installation.html#INSTALLATION-PACK-WIN"
+TARGET="_top"
+> the <I
+CLASS="CITETITLE"
+>User Manual</I
+></A
+> for details on how to install and configure
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> as a service.</P
+><P
+> Earlier 3.x versions could run as a system service using <B
+CLASS="COMMAND"
+>srvany.exe</B
+>.
+ See the discussion at <A
+HREF="https://sourceforge.net/tracker/?func=detail&atid=361118&aid=485617&group_id=11118"
+TARGET="_top"
+>https://sourceforge.net/tracker/?func=detail&atid=361118&aid=485617&group_id=11118</A
+>,
+ for details, and a sample configuration.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="OTHERPROXY"
+>3.17. How can I make Privoxy work with other proxies?</A
+></H3
+><P
+> This can be done and is often useful to combine the benefits of
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> with those of a another proxy,
+ for example to cache content.
+ See the <A
+HREF="../user-manual/config.html#FORWARDING"
+TARGET="_top"
+>forwarding chapter</A
+>
+ in the <A
+HREF="../user-manual/index.html"
+TARGET="_top"
+>User Manual</A
+> which
+ describes how to do this. If you intend to use Privoxy with Tor,
+ please also have a look at
+ <A
+HREF="misc.html#TOR"
+>How do I use Privoxy together with Tor</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="PORT-80"
+>3.18. Can I just set Privoxy to use port 80
+and thus avoid individual browser configuration?</A
+></H3
+><P
+> No, its more complicated than that. This only works with special kinds
+ of proxies known as <SPAN
+CLASS="QUOTE"
+>"intercepting"</SPAN
+> proxies
+ (<A
+HREF="configuration.html#INTERCEPTING"
+>see below</A
+>).</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="TRANSPARENT"
+>3.19. Can Privoxy run as a <SPAN
+CLASS="QUOTE"
+>"transparent"</SPAN
+> proxy?</A
+></H3
+><P
+> The whole idea of Privoxy is to modify client requests
+ and server responses in all sorts of ways and therefore
+ it's not a transparent proxy as described in
+ <A
+HREF="http://tools.ietf.org/html/rfc2616"
+TARGET="_top"
+>RFC 2616</A
+>.</P
+><P
+> However, some people say <SPAN
+CLASS="QUOTE"
+>"transparent proxy"</SPAN
+> when they
+ mean <SPAN
+CLASS="QUOTE"
+>"intercepting proxy"</SPAN
+>. If you are one of them,
+ please read the <A
+HREF="configuration.html#INTERCEPTING"
+>next entry</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="INTERCEPTING"
+>3.20. Can Privoxy run as a <SPAN
+CLASS="QUOTE"
+>"intercepting"</SPAN
+> proxy?</A
+></H3
+><P
+> <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can't intercept traffic itself,
+ but it can handle requests that where intercepted and redirected
+ with a packet filter (like <SPAN
+CLASS="APPLICATION"
+>PF</SPAN
+> or
+ <SPAN
+CLASS="APPLICATION"
+>iptables</SPAN
+>), as long as the <TT
+CLASS="LITERAL"
+>Host</TT
+>
+ header is present.
+ </P
+><P
+> As the <TT
+CLASS="LITERAL"
+>Host</TT
+> header is required by HTTP/1.1 and as most
+ web sites rely on it anyway, this limitation shouldn't be a problem.</P
+><P
+> Please refer to your packet filter's documentation to learn how to
+ intercept and redirect traffic into <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>.
+ Afterward you just have to configure <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> to
+ <A
+HREF="../user-manual/config.html#ACCEPT-INTERCEPTED-REQUESTS"
+TARGET="_top"
+>accept
+ intercepted requests</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="OUTLOOK"
+>3.21. How can I configure Privoxy for use with Outlook?</A
+></H3
+><P
+> Versions of <SPAN
+CLASS="APPLICATION"
+>Outlook</SPAN
+> prior to Office 2007, use
+ <SPAN
+CLASS="APPLICATION"
+>Internet Explorer</SPAN
+> components to both render HTML,
+ and fetch any HTTP requests that may be embedded in an HTML email. So however
+ you have <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> configured to work with IE, this
+ configuration should automatically be shared, at least with older version of
+ Internet Explorer.</P
+><P
+> Starting with Office 2007, Microsoft is instead using the MS-Word rendering
+ engine with Outlook. It is unknown whether this can be configured to use a
+ proxy.
+ </P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="OUTLOOK-MORE"
+>3.22. How can I have separate rules just for HTML mail?</A
+></H3
+><P
+> The short answer is, you can't. <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> has no way
+ of knowing which particular application makes a request, so there is no way to
+ distinguish between web pages and HTML mail.
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> just blindly proxies all requests. In the
+ case of <SPAN
+CLASS="APPLICATION"
+>Outlook Express</SPAN
+> (see above), OE uses
+ IE anyway, and there is no way for <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> to ever
+ be able to distinguish between them (nor could any other proxy type application for
+ that matter).</P
+><P
+> For a good discussion of some of the issues involved (including privacy and
+ security issues), see
+ <A
+HREF="https://sourceforge.net/tracker/?func=detail&atid=211118&aid=629518&group_id=11118"
+TARGET="_top"
+>https://sourceforge.net/tracker/?func=detail&atid=211118&aid=629518&group_id=11118</A
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="SNEAKY-COOKIES"
+>3.23. I sometimes notice cookies sneaking through. How?</A
+></H3
+><P
+> <A
+HREF="http://en.wikipedia.org/wiki/Browser_cookie"
+TARGET="_top"
+>Cookies</A
+> can be
+ set in several ways. The classic method is via the
+ <TT
+CLASS="LITERAL"
+>Set-Cookie</TT
+> HTTP header. This is straightforward, and an
+ easy one to manipulate, such as the <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> concept of
+ <A
+HREF="../user-manual/actions-file.html#SESSION-COOKIES-ONLY"
+TARGET="_top"
+>session-cookies-only</A
+>.
+ There is also the possibility of using
+ <A
+HREF="http://en.wikipedia.org/wiki/Javascript"
+TARGET="_top"
+>Javascript</A
+> to
+ set cookies (<SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> calls these <TT
+CLASS="LITERAL"
+>content-cookies</TT
+>). This
+ is trickier because the syntax can vary widely, and thus requires a certain
+ amount of guesswork. It is not realistic to catch all of these short of
+ disabling Javascript, which would break many sites. And lastly, if the
+ cookies are embedded in a HTTPS/SSL secure session via Javascript, they are beyond
+ <SPAN
+CLASS="APPLICATION"
+>Privoxy's</SPAN
+> reach.</P
+><P
+> All in all, <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> can help manage cookies in general, can help minimize
+ the loss of privacy posed by cookies, but can't realistically stop all
+ cookies.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="EVIL-COOKIES"
+>3.24. Are all cookies bad? Why?</A
+></H3
+><P
+> No, in fact there are many beneficial uses of
+ <A
+HREF="http://en.wikipedia.org/wiki/Browser_cookie"
+TARGET="_top"
+>cookies</A
+>. Cookies are just a
+ method that browsers can use to store data between pages, or between browser
+ sessions. Sometimes there is a good reason for this, and the user's life is a
+ bit easier as a result. But there is a long history of some websites taking
+ advantage of this layer of trust, and using the data they glean from you and
+ your browsing habits for their own purposes, and maybe to your potential
+ detriment. Such sites are using you and storing their data on your system.
+ That is why the privacy conscious watch from whom those cookies come, and why
+ they really <SPAN
+CLASS="emphasis"
+><I
+CLASS="EMPHASIS"
+>need</I
+></SPAN
+> to be there.</P
+><P
+> See the
+ <A
+HREF="http://en.wikipedia.org/wiki/Browser_cookie"
+TARGET="_top"
+>Wikipedia cookie
+ definition</A
+> for more.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="ALLOW-COOKIES"
+>3.25. How can I allow permanent cookies for my trusted sites?</A
+></H3
+><P
+> There are several actions that relate to cookies. The default behavior is to
+ allow only <SPAN
+CLASS="QUOTE"
+>"session cookies"</SPAN
+>, which means the cookies only last
+ for the current browser session. This eliminates most kinds of abuse related
+ to cookies. But there may be cases where you want cookies to last.</P
+><P
+> To disable all cookie actions, so that cookies are allowed unrestricted,
+ both in and out, for <TT
+CLASS="LITERAL"
+>example.com</TT
+>:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+> { -crunch-incoming-cookies -crunch-outgoing-cookies -session-cookies-only -filter{content-cookies} }
+ .example.com</PRE
+></TD
+></TR
+></TABLE
+><P
+> Place the above in <TT
+CLASS="FILENAME"
+>user.action</TT
+>. Note that some of these may
+ be off by default anyway, so this might be redundant, but there is no harm
+ being explicit in what you want to happen. <TT
+CLASS="FILENAME"
+>user.action</TT
+>
+ includes an alias for this situation, called
+ <TT
+CLASS="LITERAL"
+>allow-all-cookies</TT
+>.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="MULTIPLES"
+>3.26. Can I have separate configurations for different users?</A
+></H3
+><P
+> Each instance of <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+> has its own
+ configuration, including such attributes as the TCP port that it listens on.
+ What you can do is run multiple instances of <SPAN
+CLASS="APPLICATION"
+>Privoxy</SPAN
+>, each with
+ a unique
+ <A
+HREF="../user-manual/config.html#LISTEN-ADDRESS"
+TARGET="_top"
+>listen-address</A
+>
+ configuration setting, and configuration path, and then
+ each of these can have their own configurations. Think of it as per-port
+ configuration.</P
+><P
+> Simple enough for a few users, but for large installations, consider having
+ groups of users that might share like configurations.</P
+></DIV
+><DIV
+CLASS="SECT2"
+><H3
+CLASS="SECT2"
+><A
+NAME="WHITELISTS"
+>3.27. Can I set-up Privoxy as a whitelist of
+<SPAN
+CLASS="QUOTE"
+>"good"</SPAN
+> sites?</A
+></H3
+><P
+> Sure. There are a couple of things you can do for simple white-listing.
+ Here's one real easy one:</P
+><TABLE
+BORDER="0"
+BGCOLOR="#E0E0E0"
+WIDTH="100%"
+><TR
+><TD
+><PRE
+CLASS="SCREEN"
+> ############################################################