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- <div class="SECT1">
- <h1 class="SECT1"><a name="TROUBLE" id="TROUBLE">5.
- Troubleshooting</a></h1>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN1091" id="AEN1091">5.1. I cannot connect
- to any websites. Or, I am getting <span class="QUOTE">"connection
- refused"</span> message with every web page. Why?</a></h3>
-
- <p>There are several possibilities:</p>
-
- <ul>
- <li>
- <p><span class="APPLICATION">Privoxy</span> is not running.
- Solution: verify that <span class="APPLICATION">Privoxy</span> is
- installed correctly, has not crashed, and is indeed running. Turn
- on <span class="APPLICATION">Privoxy's</span> logging, and look at
- the logs to see what they say.</p>
- </li>
-
- <li>
- <p>Or your browser is configured for a different port than what
- <span class="APPLICATION">Privoxy</span> is using. Solution: verify
- that <span class="APPLICATION">Privoxy</span> and your browser are
- set to the same port (<tt class="LITERAL">listen-address</tt>).</p>
- </li>
-
- <li>
- <p>Or if using a forwarding rule, you have a configuration problem
- or a problem with a host in the forwarding chain. Solution:
- temporarily alter your configuration and take the forwarders out of
- the equation.</p>
- </li>
-
- <li>
- <p>Or you have a firewall that is interfering and blocking you.
- Solution: try disabling or removing the firewall as a simple
- test.</p>
- </li>
- </ul>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="ERROR503" id="ERROR503">5.2. Why am I
- getting a 503 Error (WSAECONNREFUSED) on every page?</a></h3>
-
- <p>More than likely this is a problem with your TCP/IP networking.
- ZoneAlarm has been reported to cause this symptom -- even if not
- running! The solution is to either fight the ZA configuration, or
- uninstall ZoneAlarm, and then find something better behaved in its
- place. Other personal firewall type products may cause similar type
- problems if not configured correctly.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="AEN1114" id="AEN1114">5.3. I just added a
- new rule, but the steenkin ad is still getting through. How?</a></h3>
-
- <p>If the ad had been displayed before you added its URL, it will
- probably be held in the browser's cache for some time, so it will be
- displayed without the need for any request to the server, and
- <span class="APPLICATION">Privoxy</span> will not be involved. Flush
- the browser's caches, and then try again.</p>
-
- <p>If this doesn't help, you probably have an error in the rule you
- applied. Try pasting the full URL of the offending ad into <a href=
- "http://config.privoxy.org/show-url-info" target=
- "_top">http://config.privoxy.org/show-url-info</a> and see if it really
- matches your new rule. Blocking ads is like blocking spam: a lot of
- tinkering is required to stay ahead of the game. And remember you need
- to block the URL of the ad in question, which may be entirely different
- from the site URL itself. Most ads are hosted on different servers than
- the main site itself. If you right-click on the ad, you should be able
- to get all the relevant information you need. Alternately, you can find
- the correct URL by looking at <span class=
- "APPLICATION">Privoxy's</span> logs (you may need to enable logging in
- the main config file if its disabled).</p>
-
- <p>Below is a slightly modified real-life log snippet that originates
- with one requested URL: <tt class="LITERAL">www.example.com</tt> (name
- of site was changed for this example, the number of requests is real).
- You can see in this the complexity of what goes into making up this one
- <span class="QUOTE">"page"</span>. There are eight different domains
- involved here, with thirty two separate URLs requested in all, making
- up all manner of images, Shockwave Flash, JavaScript, CSS stylesheets,
- scripts, and other related content. Some of this content is obviously
- <span class="QUOTE">"good"</span> or <span class="QUOTE">"bad"</span>,
- but not all. Many of the more questionable looking requests, are going
- to outside domains that seem to be identifying themselves with
- suspicious looking names, making our job a little easier. <span class=
- "APPLICATION">Privoxy</span> has <span class="QUOTE">"crunched"</span>
- (meaning caught and BLOCKED) quite a few items in this example, but
- perhaps missed a few as well.</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
-Request: www.example.com/
-Request: www.example.com/favicon.ico
-Request: img.example.com/main.css
-Request: img.example.com/sr.js
-Request: example.betamarker.com/example.html
-Request: www.lik-sang.com/Banners/bestsellers/skyscraper.php?likref=BSellers
-Request: img.example.com/pb.png
-Request: www.google-analytics.com/urchin.js crunch! (Blocked)
-Request: www.advertising-department.com/ats/switch.ps.php?26856 crunch! (Blocked)
-Request: img.example.com/p.gif
-Request: www.popuptraffic.com/assign.php?l=example&mode=behind crunch! (Blocked)
-Request: www.popuptraffic.com/scripts/popup.php?hid=5c3cf&tmpl=PBa.tmpl crunch! (Blocked)
-Request: www.popuptraffic.com/assign.php?l=example crunch! (Blocked)
-Request: www.lik-sang.com/Banners/best_sellers/best_sellers.css
-Request: www.adtrak.net/adx.js crunch! (Blocked)
-Request: img.example.com/hbg.gif
-Request: img.example.com/example.jpg
-Request: img.example.com/mt.png
-Request: img.example.com/mm.png
-Request: img.example.com/mb.png
-Request: www.popuptraffic.com/scripts/popup.php?hid=a71b91fa5&tmpl=Ua.tmp crunch! (Blocked)
-Request: www.example.com/tracker.js
-Request: www.lik-sang.com/Banners/best_sellers/lsi_head.gif
-Request: www.adtrak.net/adjs.php?n=020548130&what=zone:61 crunch! (Blocked)
-Request: www.adtrak.net/adjs.php?n=463594413&what=zone:58&source=Ua crunch! (Blocked)
-Request: www.lik-sang.com/Banners/best_sellers/bottomani.swf
-Request: mmm.elitemediagroup.net/install.php?allowpop=no&popupmincook=0&allowsp2=1 crunch! (Blocked)
-Request: www.example.com/tracker.js?screen=1400x1050&win=962x693
-Request: www.adtrak.net/adlog.php?bannerid=1309&clientid=439&zoneid=61 crunch! (Blocked)
-Request: 66.70.21.80/scripts/click.php?hid=5c3cf599a9efd0320d26&si
-Request: 66.70.21.80/img/pixel.gif
-Request: www.adtrak.net/adlog.php?bannerid=1309&clientid=439&zoneid=58&source=Ua&block=86400 crunch! (Blocked)
-Request: 66.70.21.80/scripts/click.php?hid=a71b9f6504b0c5681fa5&si=Ua
-</pre>
- </td>
- </tr>
- </table>
-
- <p>Despite 12 out of 32 requests being blocked, the page looked, and
- seemed to behave perfectly <span class="QUOTE">"normal"</span> (minus
- some ads, of course).</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="BADSITE" id="BADSITE">5.4. One of my
- favorite sites does not work with Privoxy. What can I do?</a></h3>
-
- <p>First verify that it is indeed a <span class=
- "APPLICATION">Privoxy</span> problem, by toggling off <span class=
- "APPLICATION">Privoxy</span> through <a href=
- "http://config.privoxy.org/toggle" target=
- "_top">http://config.privoxy.org/toggle</a> (the toggle feature may
- need to be enabled in the main <tt class="FILENAME">config</tt>), and
- then shift-reloading the problem page (i.e. holding down the shift key
- while clicking reload. Alternatively, flush your browser's disk and
- memory caches).</p>
-
- <p>If the problem went away, we know we have a configuration related
- problem. Now go to <a href="http://config.privoxy.org/show-url-info"
- target="_top">http://config.privoxy.org/show-url-info</a> and paste the
- full URL of the page in question into the prompt. See which actions are
- being applied to the URL, and which matches in which actions files are
- responsible for that. It might be helpful also to look at your logs for
- this site too, to see what else might be happening (note: logging may
- need to be enabled in the main config file). Many sites are complex and
- require a number of related pages to help present their content. Look
- at what else might be used by the page in question, and what of that
- might be <span class="emphasis"><i class=
- "EMPHASIS">required</i></span>. Now, armed with this information, go to
- <a href="http://config.privoxy.org/show-status" target=
- "_top">http://config.privoxy.org/show-status</a> and select the
- appropriate actions files for editing.</p>
-
- <p>You can now either look for a section which disables the actions
- that you suspect to cause the problem and add a pattern for your site
- there, or make up a completely new section for your site. In any case,
- the recommended way is to disable only the prime suspect, reload the
- problem page, and only if the problem persists, disable more and more
- actions until you have identified the culprit. You may or may not want
- to turn the other actions on again. Remember to flush your browser's
- caches in between any such changes!</p>
-
- <p>Alternately, if you are comfortable with a text editor, you can
- accomplish the same thing by editing the appropriate actions file.
- Probably the easiest way to deal with such problems when editing by
- hand is to add your site to a <tt class="LITERAL">{ fragile }</tt>
- section in <tt class="FILENAME">user.action</tt>, which is an alias
- that turns off most <span class="QUOTE">"dangerous"</span> actions, but
- is also likely to turn off more actions then needed, and thus lower
- your privacy and protection more than necessary,</p>
-
- <p>Troubleshooting actions is discussed in more detail in the <a href=
- "../user-manual/appendix.html#ACTIONSANAT" target="_top">User Manual
- appendix, Troubleshooting: the Anatomy of an Action</a>. There is also
- an <a href="../user-manual/actions-file.html#ACT-EXAMPLES" target=
- "_top">actions tutorial</a> with general configuration information and
- examples.</p>
-
- <p>As a last resort, you can always see if your browser has a setting
- that will bypass the proxy setting for selective sites. Modern browsers
- can do this.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DUN" id="DUN">5.5. After installing Privoxy,
- I have to log in every time I start IE. What gives?</a></h3>
-
- <p>This is a quirk that effects the installation of <span class=
- "APPLICATION">Privoxy</span>, in conjunction with Internet Explorer and
- Internet Connection Sharing on Windows 2000 and Windows XP. The
- symptoms may appear to be corrupted or invalid DUN settings, or
- passwords.</p>
-
- <p>When setting up an NT based Windows system with <span class=
- "APPLICATION">Privoxy</span> you may find that things do not seem to be
- doing what you expect. When you set your system up you will probably
- have set up Internet Connection Sharing (ICS) with Dial up Networking
- (DUN) when logged in with administrator privileges. You will probably
- have made this DUN connection available to other accounts that you may
- have set-up on your system. E.g. Mum or Dad sets up the system and
- makes accounts suitably configured for the kids.</p>
-
- <p>When setting up <span class="APPLICATION">Privoxy</span> in this
- environment you will have to alter the proxy set-up of Internet
- Explorer (IE) for the specific DUN connection on which you wish to use
- <span class="APPLICATION">Privoxy</span>. When you do this the ICS DUN
- set-up becomes user specific. In this instance you will see no
- difference if you change the DUN connection under the account used to
- set-up the connection. However when you do this from another user you
- will notice that the DUN connection changes to make available to "Me
- only". You will also find that you have to store the password under
- each different user!</p>
-
- <p>The reason for this is that each user's set-up for IE is user
- specific. Each set-up DUN connection and each LAN connection in IE
- store the settings for each user individually. As such this enforces
- individual configurations rather than common ones. Hence the first time
- you use a DUN connection after re-booting your system it may not
- perform as you expect, and prompt you for the password. Just set and
- save the password again and all should be OK.</p>
-
- <p>[Thanks to Ray Griffith for this submission.]</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="FTP" id="FTP">5.6. I cannot connect to any
- FTP sites. Privoxy is blocking me.</a></h3>
-
- <p><span class="APPLICATION">Privoxy</span> cannot act as a proxy for
- FTP traffic, so do not configure your browser to use <span class=
- "APPLICATION">Privoxy</span> as an FTP proxy. The same is true for
- <span class="emphasis"><i class="EMPHASIS">any protocol other than HTTP
- or HTTPS (SSL)</i></span>.</p>
-
- <p>Most browsers understand FTP as well as HTTP. If you connect to a
- site, with a URL like <tt class="LITERAL">ftp://ftp.example.com</tt>,
- your browser is making an FTP connection, and not a HTTP connection. So
- while your browser may speak FTP, <span class=
- "APPLICATION">Privoxy</span> does not, and cannot proxy such
- traffic.</p>
-
- <p>To complicate matters, some systems may have a generic <span class=
- "QUOTE">"proxy"</span> setting, which will enable various protocols,
- including <span class="emphasis"><i class="EMPHASIS">both</i></span>
- HTTP and FTP proxying! So it is possible to accidentally enable FTP
- proxying in these cases. And of course, if this happens, <span class=
- "APPLICATION">Privoxy</span> will indeed cause problems since it does
- not know FTP. Newer version will give a sane error message if a FTP
- connection is attempted. Just disable the FTP setting and all will be
- well again.</p>
-
- <p>Will <span class="APPLICATION">Privoxy</span> ever proxy FTP
- traffic? Unlikely. There just is not much reason, and the work to make
- this happen is more than it may seem.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="MACOSXIE" id="MACOSXIE">5.7. In Mac OS X, I
- can't configure Microsoft Internet Explorer to use Privoxy as the HTTP
- proxy.</a></h3>
-
- <p>Microsoft Internet Explorer (in versions like 5.1) respects
- system-wide network settings. In order to change the HTTP proxy, open
- System Preferences, and click on the Network icon. In the settings pane
- that comes up, click on the Proxies tab. Ensure the "Web Proxy (HTTP)"
- checkbox is checked and enter <tt class="LITERAL">127.0.0.1</tt> in the
- entry field. Enter <tt class="LITERAL">8118</tt> in the Port field. The
- next time you start IE, it should reflect these values.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="MACOSXUNINSTALL" id="MACOSXUNINSTALL">5.8.
- In Mac OS X, I dragged the Privoxy folder to the trash in order to
- uninstall it. Now the finder tells me I don't have sufficient
- privileges to empty the trash.</a></h3>
-
- <p>Note: This ONLY applies to privoxy 3.0.6 and earlier.</p>
-
- <p>Just dragging the <span class="APPLICATION">Privoxy</span> folder to
- the trash is not enough to delete it. <span class=
- "APPLICATION">Privoxy</span> supplies an <span class=
- "APPLICATION">uninstall.command</span> file that takes care of these
- details. Open the trash, drag the <span class=
- "APPLICATION">uninstall.command</span> file out of the trash and
- double-click on it. You will be prompted for confirmation and the
- administration password.</p>
-
- <p>The trash may still appear full after this command; emptying the
- trash from the desktop should make it appear empty again.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="MACOSXIMAGES" id="MACOSXIMAGES">5.9. In Mac
- OS X Panther (10.3), images often fail to load and/or I experience
- random delays in page loading. I'm using <tt class=
- "LITERAL">localhost</tt> as my browser's proxy setting.</a></h3>
-
- <p>We believe this is due to an IPv6-related bug in Mac OS X, but don't
- fully understand the issue yet. In any case, changing the proxy setting
- to <tt class="LITERAL">127.0.0.1</tt> instead of <tt class=
- "LITERAL">localhost</tt> works around the problem.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="BLANKPAGE" id="BLANKPAGE">5.10. I get a
- completely blank page at one site. <span class="QUOTE">"View
- Source"</span> shows only: <span class=
- "MARKUP"><html><body></body></html></span>.
- Without Privoxy the page loads fine.</a></h3>
-
- <p>Chances are that the site suffers from a bug in <a href=
- "http://www.php.net/" target="_top"><span class=
- "APPLICATION">PHP</span></a>, which results in empty pages being sent
- if the client explicitly requests an uncompressed page, like
- <span class="APPLICATION">Privoxy</span> does. This bug has been fixed
- in PHP 4.2.3.</p>
-
- <p>To find out if this is in fact the source of the problem, try adding
- the site to a <tt class="LITERAL">-prevent-compression</tt> section in
- <tt class="FILENAME">user.action</tt>:</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
- # Make exceptions for ill-behaved sites:
- #
- {-prevent-compression}
- .example.com
-</pre>
- </td>
- </tr>
- </table>
-
- <p>If that works, you may also want to report the problem to the site's
- webmasters, telling them to use zlib.output_compression instead of
- ob_gzhandler in their PHP applications (workaround) or upgrade to PHP
- 4.2.3 or later (fix).</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="NOHOSTNAME" id="NOHOSTNAME">5.11. My logs
- show many <span class="QUOTE">"Unable to get my own hostname"</span>
- lines. Why?</a></h3>
-
- <p><span class="APPLICATION">Privoxy</span> tries to get the hostname
- of the system its running on from the IP address of the system
- interface it is bound to (from the <tt class="FILENAME">config</tt>
- file <span class="emphasis"><i class=
- "EMPHASIS">listen-address</i></span> setting). If the system cannot
- supply this information, <span class="APPLICATION">Privoxy</span> logs
- this condition.</p>
-
- <p>Typically, this would be considered a minor system configuration
- error. It is not a fatal error to <span class=
- "APPLICATION">Privoxy</span> however, but may result in a much slower
- response from <span class="APPLICATION">Privoxy</span> on some
- platforms due to DNS timeouts.</p>
-
- <p>This can be caused by a problem with the local <tt class=
- "FILENAME">hosts</tt> file. If this file has been changed from the
- original, try reverting it to see if that helps. Make sure whatever
- name(s) are used for the local system, that they resolve both ways.</p>
-
- <p>You should also be able to work around the problem with the <a href=
- "../user-manual/config.html#HOSTNAME" target="_top">hostname
- option</a>.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="INUSE" id="INUSE">5.12. When I try to launch
- Privoxy, I get an error message <span class="QUOTE">"port 8118 is
- already in use"</span> (or similar wording). Why?</a></h3>
-
- <p>Port 8118 is <span class="APPLICATION">Privoxy's</span> default TCP
- <span class="QUOTE">"listening"</span> port. Typically this message
- would mean that there is already one instance of <span class=
- "APPLICATION">Privoxy</span> running, and your system is actually
- trying to start a second <span class="APPLICATION">Privoxy</span> on
- the same port, which will not work. (You can have multiple instances
- but they must be assigned different ports.) How and why this might
- happen varies from platform to platform, but you need to check your
- installation and start-up procedures.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DEMORONIZER" id="DEMORONIZER">5.13. Pages
- with UTF-8 fonts are garbled.</a></h3>
-
- <p>This is caused by the <span class="QUOTE">"demoronizer"</span>
- filter. You should either upgrade <span class=
- "APPLICATION">Privoxy</span>, or at least upgrade to the most recent
- <tt class="FILENAME">default.action</tt> file available from <a href=
- "http://sourceforge.net/project/showfiles.php?group_id=11118" target=
- "_top">SourceForge</a>. Or you can simply disable the demoronizer
- filter.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DEMORONIZER2" id="DEMORONIZER2">5.14. Why
- are binary files (such as images) corrupted when Privoxy is
- used?</a></h3>
-
- <p>This may also be caused by the <span class=
- "QUOTE">"demoronizer"</span> filter, in conjunction with a web server
- that is misreporting the content type. Binary files are exempted from
- <span class="APPLICATION">Privoxy's</span> filtering (unless the web
- server by mistake says the file is something else). Either upgrade
- <span class="APPLICATION">Privoxy</span>, or go to the most recent
- <tt class="FILENAME">default.action</tt> file available from <a href=
- "http://sourceforge.net/project/showfiles.php?group_id=11118" target=
- "_top">SourceForge</a>.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DEMORONIZER3" id="DEMORONIZER3">5.15. What
- is the <span class="QUOTE">"demoronizer"</span> and why is it
- there?</a></h3>
-
- <p>The original demoronizer was a Perl script that cleaned up HTML
- pages which were created with certain Microsoft products. MS has used
- proprietary extensions to standardized font encodings (ISO 8859-1),
- which has caused problems for pages that are viewed with non-Microsoft
- products (and are expecting to see a standard set of fonts). The
- demoronizer corrected these errors so the pages displayed correctly.
- <span class="APPLICATION">Privoxy</span> borrowed from this script,
- introducing a filter based on the original demoronizer, which in turn
- could correct these errors on the fly.</p>
-
- <p>But this is only needed in some situations, and will cause serious
- problems in some other situations.</p>
-
- <p>If you are using Microsoft products, you do not need it. If you need
- to view pages with UTF-8 characters (such as Cyrillic or Chinese), then
- it will cause corruption of the fonts, and thus <span class=
- "emphasis"><i class="EMPHASIS">should not be on</i></span>.</p>
-
- <p>On the other hand, if you use non-Microsoft products, and you
- occasionally notice weird characters on pages, you might want to try
- it.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="WINDOWOPEN" id="WINDOWOPEN">5.16. Why do I
- keep seeing <span class="QUOTE">"PrivoxyWindowOpen()"</span> in raw
- source code?</a></h3>
-
- <p><span class="APPLICATION">Privoxy</span> is attempting to disable
- malicious <a href="http://en.wikipedia.org/wiki/Javascript" target=
- "_top">Javascript</a> in this case, with the <tt class=
- "LITERAL">unsolicited-popups</tt> filter. <span class=
- "APPLICATION">Privoxy</span> cannot tell very well <span class=
- "QUOTE">"good"</span> code snippets from <span class=
- "QUOTE">"bad"</span> code snippets.</p>
-
- <p>If you see this in HTML source, and the page displays without
- problems, then this is good, and likely some pop-up window was
- disabled. If you see this where it is causing a problem, such as a
- downloaded program source code file, then you should set an exception
- for this site or page such that the integrity of the page stays in tact
- by disabling all filtering.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="DNSERRORS" id="DNSERRORS">5.17. I am getting
- too many DNS errors like <span class="QUOTE">"404 No Such
- Domain"</span>. Why can't Privoxy do this better?</a></h3>
-
- <p>There are potentially several factors here. First of all, the DNS
- resolution is done by the underlying operating system -- not
- <span class="APPLICATION">Privoxy</span> itself. <span class=
- "APPLICATION">Privoxy</span> merely initiates the process and hands it
- off, and then later reports whatever the outcome was and tries to give
- a coherent message if there seems to be a problem. In some cases, this
- might otherwise be mitigated by the browser itself which might try some
- work-arounds and alternate approaches (e.g adding <span class=
- "QUOTE">"www."</span> to the URL).</p>
-
- <p>In other cases, if <span class="APPLICATION">Privoxy</span> is being
- chained with another proxy, this could complicate the issue, and cause
- undue delays and timeouts. In the case of a <span class=
- "QUOTE">"socks4a"</span> proxy, the socks server handles all the DNS.
- <span class="APPLICATION">Privoxy</span> would just be the <span class=
- "QUOTE">"messenger"</span> which is reporting whatever problem occurred
- downstream, and not the root cause of the error.</p>
-
- <p>In any case, versions newer than 3.0.3 include various improvements
- to help <span class="APPLICATION">Privoxy</span> better handle these
- cases.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="ALLCPU" id="ALLCPU">5.18. At one site
- Privoxy just hangs, and starts taking all CPU. Why is this?</a></h3>
-
- <p>This is probably a manifestation of the <span class="QUOTE">"100%
- cpu"</span> problem that occurs on pages containing many (thousands
- upon thousands) of blank lines. The blank lines are in the raw HTML
- source of the page, and the browser just ignores them. But the pattern
- matching in <span class="APPLICATION">Privoxy's</span> page filtering
- mechanism is trying to match against absurdly long strings and this
- becomes very CPU-intensive, taking a long, long time to complete.</p>
-
- <p>Until a better solution comes along, disable filtering on these
- pages, particularly the <tt class="LITERAL">js-annoyances</tt> and
- <tt class="LITERAL">unsolicited-popups</tt> filters. If you run into
- this problem with a recent <span class="APPLICATION">Privoxy</span>
- version, please send a problem report.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="SLOWCRAWL" id="SLOWCRAWL">5.19. I just
- installed Privoxy, and all my browsing has slowed to a crawl. What
- gives?</a></h3>
-
- <p>This should not happen, and for the overwhelming number of users
- world-wide, it does not happen. I would suspect some inadvertent
- interaction of software components such as anti-virus software, spyware
- protectors, personal firewalls or similar components. Try disabling (or
- uninstalling) these one at a time and see if that helps. Either way, if
- you are using a recent <span class="APPLICATION">Privoxy</span>
- version, please report the problem.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="PREVENTCOMP" id="PREVENTCOMP">5.20. Why do
- my filters work on some sites but not on others?</a></h3>
-
- <p>It's probably due to compression. It is a common practice for web
- servers to send their content <span class="QUOTE">"compressed"</span>
- in order to speed things up, and then let the browser <span class=
- "QUOTE">"uncompress"</span> them. When compiled with zlib support
- <span class="APPLICATION">Privoxy</span> can decompress content before
- filtering, otherwise you may want to enable <a href=
- "../user-manual/actions-file.html#PREVENT-COMPRESSION" target=
- "_top">prevent-compression</a>.</p>
-
- <p>As of <span class="APPLICATION">Privoxy</span> 3.0.9, zlib support
- is enabled in the default builds.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="SSL-WARNINGS" id="SSL-WARNINGS">5.21. On
- some HTTPS sites my browser warns me about unauthenticated content, the
- URL bar doesn't get highlighted and the lock symbol appears to be
- broken. What's going on?</a></h3>
-
- <p>Probably the browser is requesting ads through HTTPS and
- <span class="APPLICATION">Privoxy</span> is blocking the requests.
- Privoxy's error messages are delivered unencrypted and while it's
- obvious for the browser that the HTTPS request is already blocked by
- the proxy, some warn about unauthenticated content anyway.</p>
-
- <p>To work around the problem you can redirect those requests to an
- invalid local address instead of blocking them. While the redirects
- aren't encrypted either, many browsers don't care. They simply follow
- the redirect, fail to reach a server and display an error message
- instead of the ad.</p>
-
- <p>To do that, enable logging to figure out which requests get blocked
- by <span class="APPLICATION">Privoxy</span> and add the hosts (no path
- patterns) to a section like this:</p>
-
- <table border="0" bgcolor="#E0E0E0" width="100%">
- <tr>
- <td>
- <pre class="SCREEN">
-{+redirect{http://127.0.0.1:0/} -block -limit-connect}
-.ivwbox.de:443/
-</pre>
- </td>
- </tr>
- </table>
-
- <p>Additionally you have to configure your browser to contact
- <span class="QUOTE">"127.0.0.1:0"</span> directly (instead of through
- <span class="APPLICATION">Privoxy</span>).</p>
-
- <p>To add a proxy exception in <span class="APPLICATION">Mozilla
- Firefox</span> open the <span class="QUOTE">"Preferences"</span>, click
- the <span class="QUOTE">"Settings"</span> button located on the
- <span class="QUOTE">"Network"</span> tab in the <span class=
- "QUOTE">"Advanced"</span> section, and add <span class=
- "QUOTE">"127.0.0.1:0"</span> in the <span class="QUOTE">"No Proxy
- for:"</span> field.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="SE-LINUX" id="SE-LINUX">5.22. I get selinux
- error messages. How can I fix this?</a></h3>
-
- <p>Please report the problem to the creator of your selinux
- policies.</p>
-
- <p>The problem is that some selinux policy writers aren't familiar with
- the application they are trying to <span class="QUOTE">"secure"</span>
- and thus create policies that make no sense.</p>
-
- <p>In <span class="APPLICATION">Privoxy's</span> case the problem
- usually is that the policy only allows outgoing connections for certain
- destination ports (e.g. 80 and 443). While this may cover the standard
- ports, websites occasionally use other ports as well. This isn't a
- security problem and therefore <span class=
- "APPLICATION">Privoxy's</span> default configuration doesn't block
- these requests.</p>
-
- <p>If you really want to block these ports (and don't be able to load
- websites that don't use standard ports), you should configure Privoxy
- to block these ports as well, so it doesn't trigger the selinux
- warnings.</p>
- </div>
-
- <div class="SECT2">
- <h3 class="SECT2"><a name="GENTOO-RICERS" id="GENTOO-RICERS">5.23. I
- compiled <span class="APPLICATION">Privoxy</span> with Gentoo's portage
- and it appears to be very slow. Why?</a></h3>
-
- <p>Probably you unintentionally compiled <span class=
- "APPLICATION">Privoxy</span> without threading support in which case
- requests have to be serialized and only one can be served at the same
- time.</p>
-
- <p>Check your <span class="QUOTE">"USE"</span> flags and make sure they
- include <span class="QUOTE">"threads"</span>. If they don't, add the
- flag and rebuild <span class="APPLICATION">Privoxy</span>.</p>
-
- <p>If you compiled <span class="APPLICATION">Privoxy</span> with
- threading support (on POSIX-based systems), the <span class=
- "QUOTE">"Conditional #defines"</span> section on <a href=
- "http://config.privoxy.org/show-status" target=
- "_top">http://config.privoxy.org/show-status</a> will list <span class=
- "QUOTE">"FEATURE_PTHREAD"</span> as <span class=
- "QUOTE">"enabled"</span>.</p>
- </div>
- </div>
-
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