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Fixing a Wingate server

Upgrade your Wingate server if version prior to 2.1 : deerfield.com
Get help about Wingate at practicallynetworked.com.

Fixing a Socks 4/5 server

If you run unix Socks 4 or Socks 5, check your ACL.
Following are a few URL which could help you fix your misconfigured proxy server on a Windows machine :
Socks Proxy server : Microsoft msdn library
Upgrade and get help about your winproxy at : winproxy.com
Upgrade your sygate server : sygate.com

Fixing a Squid server

Get help for Squid ACLs at : squid-cache.org
Get detailed help at : documents.cyberabuse.org
Upgrade your Squid 1.x server at : squid-cache.org

Fixing a HTTP proxy server

Take a look at your manual for the ACL feature...
Vulnerable proxy servers can be of all types and brands. If your proxy server is not supported anymore and you are not sure about your configuration, firewall it so only your LAN can use it.
Get help about WinRoute at tinysoftware.com. They have a manual in adobe format found under downloads/support.
Get detailed help about CacheFlow at : documents.cyberabuse.org

You can then check for a misconfiguration by using GRC.com Shield's UP or Sygate online TCP scanner

by the CyberAbuse Abuse-Proxy team.