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So you want to access ftp server but any software in the world that you use gives you a connection error. Sounds similar? Then read on…

If you are able to browse any ftp site but unable to connect using any third-party tools or softwares then you are behind an ISA Firewall Server. For most part of it, it would have been done by the company you work in, the college network backbone or even some of the cybercafe chains.

ISA Server provides the two basic services of an enterprise firewall and a Web proxy/cache server. ISA Server’s firewall screens all packet-level, circuit-level, and application-level traffic. The Web cache stores and serves all regularly accessed Web content in order to reduce network traffic and provide faster access to frequently-accessed Web pages.

You may not be able to access ftp via any third pary softwares as you are behind the proxy server and dns resolution is not the same now. For this you need to download and install the ISA Firewall Client from here.

The ISA Firewall client would help translate the dns resolution and other network messages to and from the third party softwares.

PS: This is not a hack, but the normal procedure. Oflate there were many people who got confused on accessing the ftp via a proxy server.