Proxy Authentication Failed error

Question

I\'m trying to access an FTP server through an FTP SITE Proxy to bypass a firewall using it.sauronsoftware.ftp4j.FTPClient I know my username/password is correct be

Answer 1

I found the solution...

I discovered that the FTP client was responding with a different response code:

200-User authenticated by FireWall-1 authentication

In the source code of FTPProxyConnector, a response code of anything other than the regular

230-Connected to server. Logging in...

will throw an error.

I had to decompile the class file for FTPProxyConnector and then modify the source code, then recompile and save it back to the jar. Worked like a charm.