We have a contractor logged-in remotely to one of our servers. He is trying to copy some files from his corporate ftp server to our server. He is getting the above message. He also tried ftp'ing to this corporate server from my own PC and he gets the same error. He said that he can ftp to his corporate ftp server from his other client's server. I can not even ping his corporate ftp server from both our server and from own PC.

I can ftp to another external ftp site and copy files, just not to this particular corporate ftp server. Firewall is disabled on our server. No anti virus is running. This is a newly built Win 2012 server.