-<HTML
-><HEAD
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-><A
-NAME="TROUBLE"
->5. Troubleshooting</A
-></H1
-><DIV
-CLASS="SECT2"
-><H3
-CLASS="SECT2"
-><A
-NAME="AEN551"
->5.1. I just upgraded and am getting <SPAN
-CLASS="QUOTE"
->"connection refused"</SPAN
->
-with every web page?</A
-></H3
-><P
-> Either <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> is not running, or your
- browser is configured for a different port than what
- <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> is using.</P
-><P
-> The old <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> (and also
- <SPAN
-CLASS="APPLICATION"
->Junkbuster</SPAN
->) used port 8000 by
- default. This has been changed to port 8118 now, due to a conflict
- with NAS (Network Audio Service), which uses port 8000. If you haven't,
- you need to change your browser to the new port number, or alternately
- change <SPAN
-CLASS="APPLICATION"
->Privoxy's</SPAN
-> <SPAN
-CLASS="QUOTE"
->"listen-address"</SPAN
->
- setting in the <TT
-CLASS="FILENAME"
->config</TT
-> file used to start
- <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
->.</P
-></DIV
-><DIV
-CLASS="SECT2"
-><H3
-CLASS="SECT2"
-><A
-NAME="AEN564"
->5.2. 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 in the picture. The best thing to do is try flushing 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 any actions match your new rule.</P
-></DIV
-><DIV
-CLASS="SECT2"
-><H3
-CLASS="SECT2"
-><A
-NAME="AEN570"
->5.3. One of my favorite sites does not work with <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
->.
-What can I do?</A
-></H3
-><P
-> First verify that it is indeed a <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> problem,
- by disabling <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> filtering and blocking.
- Go to <A
-HREF="http://p.p/"
-TARGET="_top"
->http://p.p/</A
-> and click on
- <SPAN
-CLASS="QUOTE"
->"Toggle Privoxy On or Off"</SPAN
->, then disable it. Now try that
- page again. It's probably a good idea to flush the browser cache as well
- with <TT
-CLASS="LITERAL"
->Shift+Reload</TT
-> to flush caches.</P
-><P
-> If still a problem, go to <SPAN
-CLASS="QUOTE"
->"Show which actions apply to a URL and
- why"</SPAN
-> from <A
-HREF="http://p.p/"
-TARGET="_top"
->http://p.p/</A
-> and paste
- the full URL of the page in question into the prompt. See which actions are
- being applied to the URL. Now, armed with this information, go to
- <SPAN
-CLASS="QUOTE"
->"View & change the current configuration"</SPAN
->. Here you should see various sections that have
- various <SPAN
-CLASS="APPLICATION"
->Privoxy</SPAN
-> features disabled for specific
- sites. Most disabled <SPAN
-CLASS="QUOTE"
->"actions"</SPAN
-> will have a <SPAN
-CLASS="QUOTE"
->"-"</SPAN
-> (minus
- sign) in front of them. Some aliases are used just to disable other actions,
- e.g. <SPAN
-CLASS="QUOTE"
->"shop"</SPAN
-> and <SPAN
-CLASS="QUOTE"
->"fragile"</SPAN
->, and won't necessarily
- use a <SPAN
-CLASS="QUOTE"
->"+"</SPAN
-> or <SPAN
-CLASS="QUOTE"
->"-"</SPAN
-> sign. Add your problem page
- URL to one of these sections that looks like it is disabling the feature that
- is causing the problem. Rember to flush your browser's caches when making
- such changes! As a last resort, try <SPAN
-CLASS="QUOTE"
->"fragile"</SPAN
-> which
- disables most actions. Now re-try the page. There might be some trial and
- error involved. This is discussed in more detail in the <A
-HREF="../user-manual/appendix.html#ACTIONSANAT"
-TARGET="_top"
->user-manual appendix</A
->. </P
-><P
-> Alternately, if you are comfortable with a text editor, you can accomplish
- the same thing by editing the appropriate <SPAN
-CLASS="QUOTE"
->"actions"</SPAN
-> file.</P
-></DIV
-></DIV
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-CLASS="NAVFOOTER"
-><HR
-ALIGN="LEFT"
-WIDTH="100%"><TABLE
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-HREF="misc.html"
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+ <meta name="generator" content="HTML Tidy, see www.w3.org">
+ <title>
+ Troubleshooting
+ </title>
+ <meta name="GENERATOR" content=
+ "Modular DocBook HTML Stylesheet Version 1.79">
+ <link rel="HOME" title="Privoxy Frequently Asked Questions" href=
+ "index.html">
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+ <th colspan="3" align="center">
+ Privoxy Frequently Asked Questions
+ </th>
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+ <tr>
+ <td width="10%" align="left" valign="bottom">
+ <a href="misc.html" accesskey="P">Prev</a>
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+ <a href="contact.html" accesskey="N">Next</a>
+ </td>
+ </tr>
+ </table>
+ <hr width="100%" class="c1">
+ </div>
+ <div class="SECT1">
+ <h1 class="SECT1">
+ <a name="TROUBLE">5. Troubleshooting</a>
+ </h1>
+ <div class="SECT2">
+ <h3 class="SECT2">
+ <a name="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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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">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>
+ <div class="NAVFOOTER">
+ <hr width="100%" class="c1">
+ <table summary="Footer navigation table" width="100%" border="0"
+ cellpadding="0" cellspacing="0">
+ <tr>
+ <td width="33%" align="left" valign="top">
+ <a href="misc.html" accesskey="P">Prev</a>
+ </td>
+ <td width="34%" align="center" valign="top">
+ <a href="index.html" accesskey="H">Home</a>
+ </td>
+ <td width="33%" align="right" valign="top">
+ <a href="contact.html" accesskey="N">Next</a>
+ </td>
+ </tr>
+ <tr>
+ <td width="33%" align="left" valign="top">
+ Miscellaneous
+ </td>
+ <td width="34%" align="center" valign="top">
+
+ </td>
+ <td width="33%" align="right" valign="top">
+ Contacting the developers, Bug Reporting and Feature Requests
+ </td>
+ </tr>
+ </table>
+ </div>
+ </body>
+</html>
+
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