How to Install and Setup Squid Proxy on Windows

    The purpose of this document is to guide your step by step to insall and configurate squid on Windows.


    • squid for windows 2.7
    • Windows XP sp3


    Download Squid

    You should download squid 2.7 for Windows from Then unzip the file, copy squid directory to the “C:/”. If you modify it, is not recommended.

    Init configuration

    To open command prompt as Administrator, and type below commands to copy default configuration files and install squid as windows service.

    > cd /d c:\squid\etc
    > copy *.default *.


    Basic configuration

    Restricting access to your Squid Proxy Server

    To limit on who are allowed to connect to your Proxy Server, you should change / add the allowed IP Address that is allowed to connect to your squid proxy at below section

    #acl localnet src	# RFC1918 possible internal network
    #acl localnet src	# RFC1918 possible internal network
    acl localnet src	# RFC1918 possible internal network

    then right before http_access allow localnet, add http_access allow localhost so it looks like:

    http_access allow localhost
    http_access allow localnet

    Limiting access to specific ports only

    If you need to limit on which ports your Squid proxy clients are allowed to connect to, then you need to adjust this

    acl Safe_ports port 80		# http
    acl Safe_ports port 21		# ftp
    acl Safe_ports port 443		# https
    acl Safe_ports port 70		# gopher
    acl Safe_ports port 210		# wais
    acl Safe_ports port 1025-65535	# unregistered ports
    acl Safe_ports port 280		# http-mgmt
    acl Safe_ports port 488		# gss-http
    acl Safe_ports port 591		# filemaker
    acl Safe_ports port 777		# multiling http

    For example if you want to limit your clients to HTTP and HTTPS only, then you can remove / comment all the other lines beside 80 and 443.

    Changing disk cache location and size

    For better performance, it’s better to put the Squid cache directory into another partition (in other words, not your system partition) and even better on different hard drive. So find this line:

    cache_dir ufs c:/squid/var/cache 100 16 256

    And then change it to any directory you want, and also adjust the disk cache size to your liking, for example to put your squid cache directory at X:\squid-data\cache with a maximum capacity of 1500 MB

    cache_dir ufs x:/squid-data/cache 1500 16 256

    Also it’d better to put all squid logs into different partition too

    cache_log x:/squid-data/logs/cache.log 		#c:/squid/var/logs/cache.log
    access_log x:/squid-data/logs/access.log 	#c:/squid/var/logs/access.log squid
    cache_store_log x:/squid-data/store.log 	#c:/squid/var/logs/store.log

    Creating Squid cache data directory

    Now back at the command prompt again, and this time type:

    > c:\squid\sbin\squid.exe -z

    To create Squid Swap Directories which is used to store cached objects

    Parsing configuration

    > c:\squid\sbin\squid -k parse

    Starting Squid Service

    > c:\squid\sbin\squid -i

    Then , you should start the squid service on the control panel. If you choose command prompt method then you need to type (run command prompt as administrator):

    > net start squid

    Note: if you want to uninstall squid services, you should run the following command:

    > c:\squid\sbin\squid -r

    Advanced Configuration

    Object cache size

    maximum_object_size 64 MB
    cache_mem 96 MB
    maximum_object_size_in_memory 256 KB


    Add the following line on the end of the file:


    NOTE This setting is necessary, or you will can`t visit some website.



    Enable TCP/IP Forwarding on Windows

    To enable TCP/IP forwarding, follow these steps:

    Start Registry Editor

    To run the command “Regedit.exe” on the cmd.

    Modify the key

    In Registry Editor, locate the following registry key:

    Set the following registry value:
    Value Name: IPEnableRouter
    Value type: REG_DWORD
    Value Data: 1

    A value of 1 enables TCP/IP forwarding for all network connections that are installed and used by this computer.

    Quit Registry Editor.

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