Joined: 26 Apr 2004 Posts: 4649 Location: Raleigh, NC, USA
A few things you might try:
Run a TRACERTE from your system to the server to make sure all of the network paths are able to connect.
Run a PING to that server and make sure you're seeing a response.
Start FTP to see if the FTP Server is responding.
Beyond these few tasks, I'd either involve a network engineer and have them setup a sniffer trace, or if it looked as if the problem was with the remote server, I'd turn it over to its support team for a resolution.