When running a SFTP server test in Director we're getting the following error on some but not all of the sites -
Session.connect: java.io.IOException: Proxy handshake failed with the error: [version=1;type=CONNECT_REPLY;status=CONNECTION_TIMEDOUT;remoteAddress=??.??.??.??:????;localAddress=0.0.0.0:0]
Where ??? is the remote address and port.
This isn't for all SFTP servers as some do work, but the ones that don't have this error.
We're not sure if the problem is with us or the external companies we're trying to connect to so was wondering if anyone has had this issue before and what the resolution was.