gpo proxy server settinngs for all applications

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http://serverfault.com – i am trying to set all internet connections of all network PCs via proxy server that is installed on windows server 2003 i have editted proxy setting from gpo, but it only worked for internet browsers, is there way to force all applications to use that proxy (applications like chatting apps, IDM, torrent and others) note: i am using ccproxy as a proxy server (HowTos)