Trying to access an FTP site under SBS 2003 and ISA 2004 gives me an error 502 proxy error access denied.

I am trying to access an outside FTP site under my SBS 2003 network using a client PC running Windows 7. It doesn;t matter what browser I use (Explorer or Firefox) the result is the same I keep getting an error code on either browsers Error code 502. Like the proxy is blocking something.

Can anyone help?
cmdolcetAsked:
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Larry Struckmeyer MVPCommented:
Have you been sucessful with any other FTP site?  ISA 2004 has a default rule to allow port 21 and 22 so perhaps your edge device/router/firewall is blocking?

However, you can test ISA with real time monitoring.
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cmdolcetAuthor Commented:
I only have the ISA firewall installed no
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cmdolcetAuthor Commented:
How can I do this?
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cmdolcetAuthor Commented:
No all other FTP sites seem to be doing the same as I described above.
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