Runing BM3.8 on nw6.5. Running FTP proxy.

When a user tries to ftp to a specific site that requires authentication
they get the 504 gateway timeout error. This site is accessible using dial
up or another network but when the users goes via the proxy this error
occurrs. Accessing anonymous sites such as works fine.

Is there anything specific required for passing through authentication to
the ftp server? I have tried using the ftp://username:password@site
convention but that hasn't worked either. It takes a long time but
eventually gives the same error. I am using IE with the folder option turned
off as per TID 10060472.

Any assistance appreciated.