Frequently Asked Questions About Linux / UNIX » Squid

Squid Proxy Server Change Outgoing IP Address

nixCraft — Tue, 15 Jan 2013 08:04:55 +0000

I have Squid caching proxy server deployed on Rackspace based server in UK. This server has four IP address. I would like to change outgoing IP addresses from default 1.2.3.1 to 1.2.3.4. How do I change proxy server outgoing IP address under Linux or Unix operating systems?

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Set/Export: http_proxy With Special Characters In Password Under Unix / Linux

nixCraft — Tue, 04 Dec 2012 20:56:28 +0000

My proxy server password has special characters such as !,@, and so on. How do I set and export the variable called http_proxy or HTTP_PROXY when password has special characters under Unix like operating systems?

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HowTo: Test a Proxy PAC File Syntax With Syntax Checker

nixCraft — Tue, 20 Nov 2012 16:32:41 +0000

How can I test a Proxy PAC file syntax under Apple OS X / Linux / *BSD or Unix like operating systems using command line options?

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HowTo: Use Auto Config Proxy PAC File For Specific Domain

nixCraft — Tue, 20 Nov 2012 12:13:48 +0000

I would like to use the squid proxy server only for one domain called foo.example.com. How do I auto-configuring proxy settings with a PAC file to hide one domain and connect everything else directly? How do I specify a URL in a PAC file to bypass proxy server? How do I create exceptions using a PAC file?

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HowTo: Listen Pandora In Europe ( Outside USA )

nixCraft — Sat, 17 Nov 2012 10:58:26 +0000

I have Pandora Internet Radio One subscription, and recently I moved to Europe for a few months as part of my work schedule. The service fully available only in the United States. How do I access Pandora one service in Europe? Can I get around it by using a proxy server installed on my own server located in USA at home or ISP data center?

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Debian / Ubuntu Linux: Install SquidGuard Web Filter Plugin For Squid 3.x To Block Unwanted Sites

nixCraft — Tue, 21 Aug 2012 20:52:45 +0000

How do I install and configure SquidGuard - a web filter plugin for Squid to restrict access to domains/URLs based upon access control lists? How do I block porn, gambling, and other web-sites using squid proxy server version 3.x under Debian or Ubuntu Linux server for my school?

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Reload Squid Proxy Server Without Restarting Squid Daemon

nixCraft — Wed, 18 Jan 2012 11:45:43 +0000

I made some changes to the /etc/squid/squid.conf file and issued the command /sbin/service squid restart. However, this command takes way too much time to restart the server. How do I tell squid to just reread the config file and apply new changes under Linux operating systems?

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Use wget with Squid Proxy Server

nixCraft — Sat, 28 Aug 2010 09:20:56 +0000

How do I make wget work with Squid under UNIX or Linux operating systems?

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setroubleshoot: SELinux is preventing the squid (squid_t) from binding to port 5000 Error and Solution

nixCraft — Thu, 15 Jul 2010 21:02:04 +0000

I've setup Squid Proxy server as described here, but I'm getting errors which read as follows:

Jul 14 15:09:02 server1 squid[5315]: Squid Parent: child process 5317 started Jul 14 15:09:02 server1 squid[5317]: Cannot open HTTP Port Jul 14 15:09:02 server1 squid[5315]: Squid Parent: child process 5317 exited due to signal 6 Jul 14 15:09:02 server1 setroubleshoot: SELinux is preventing the squid (squid_t) from binding to port 5000. For complete SELinux messages. run sealert -l 1cf3c788-35f7-4752-8439-92a1d0719466

How do I fix this problem?

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FreeBSD Squid Proxy Caching Server Increase File Descriptors Limits

nixCraft — Thu, 18 Jun 2009 17:56:03 +0000

I'm getting an error which read as follows under FreeBSD 7.2 server and Squid stable caching server:

WARNING! Your cache is running out of filedescriptors

How do I fix this problem and increase the number of system-wide available filedescriptors for FreeBSD server?

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Squid Listen on Other Port ( Squid Configure Port Listing with SELinux)

nixCraft — Mon, 20 Apr 2009 12:26:32 +0000

My Squid proxy server running on port 3128. Since this is frequently scanned by adversaries looking for proxy servers; I've changed port to 10000 and restart squid. But my squid is not working on port # 10000 it only works on port # 3128? How do I force Squid to listen on uncommon port under CentOS Linux v5.3?

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Squid Proxy Hide System’s Real IP Address

nixCraft — Thu, 19 Feb 2009 20:57:44 +0000

My squid proxy server is displaying system's real IP address. I've a corporate password protected squid proxy server located at 202.54.1.2. My clients works from home or offices via A/DSL / cable connections. Squid should hide all system's IP address, but it is forwarding and displaying the system's IP address. How do I configure squid to hide client's real IP address?

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Update FreeBSD Using Proxy Server (csup / portsnap proxy update)

nixCraft — Wed, 19 Nov 2008 11:16:49 +0000

Question: How do I upgrade my FreeBSD server and ports tree using our proxy server, which requires username and password based authentication?

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Squid Proxy WARNING! Your cache is running out of filedescriptors error and solution

nixCraft — Mon, 16 Jun 2008 13:13:13 +0000

I've Squid Proxy server with over 100 Windows workstation. I see following error message in my cache.log file - "WARNING! Your cache is running out of filedescriptors". Do I need to filter proxy server requests to avoid this problem? How do I fix this problem under CentOS / Fedora / RHEL / Debian Linux?

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How To Use Proxy Server To Access Internet at Shell Prompt With http_proxy Variable

nixCraft — Fri, 09 May 2008 13:15:52 +0000

I'm behind a squid proxy server. How do I access internet via proxy server when I use wget, lynx and other utilities from a shell prompt?

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Linux Disabling Squid Proxy Server

nixCraft — Thu, 13 Mar 2008 13:13:51 +0000

How do I disable Squid Proxy Serer under CentOS Linux operating system so that I can directly connect to the internet?

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Squid Block any Domain Name Accessing the Internet

nixCraft — Thu, 31 Jan 2008 13:13:10 +0000

Q. How do I block any website accessing the Internet using squid proxy server? A. You can simply use squid ACL to block access to any web site. There are 3 steps: #1. Create a text file with blocked domain name list such as baddomain1.com, mail.yahoo.com, gmail.com and so on #2. Define Acl #3. Restart [...]

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Squid Proxy Server Mac Address based filtering

nixCraft — Thu, 01 Nov 2007 12:42:09 +0000

Q. I'm using squid proxy server under CentOS Linux version 5. How to filter a particular MAC address under squid? A. Not all operating system supports Mac address based filtering. For some operating systems. Squid calls these "ARP ACLs" and they are supported on Linux, Solaris, and BSD variants. How do I set up ACL's [...]

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Squid proxy authentication in transparent mode

nixCraft — Thu, 01 Nov 2007 12:31:48 +0000

Q. I was referring to your Squid transparent proxy configuration howto, and my question to you - can proxy authentication be done in transparent mode? A. Short answer: noop, you cannot use Squid proxy authentication in transparent mode. From official squid docs: Authentication cannot be used in a transparently intercepting proxy as the client then [...]

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How to: Linux / UNIX setup Squid Proxy authentication

nixCraft — Mon, 08 Oct 2007 13:25:44 +0000

Q. I'm using Squid Cache Version 2.6.STABLE. It is configured perfectly and I'd like to know how do I allow squid to only authenticated users? A. Squid can authenticate users if squid is configured to use proxy_auth ACLs. Browsers send the user's authentication credentials in the Authorization request header. If Squid gets a request and [...]

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