I have a server at a remote site, the sites are connected to each other a site-to-site VPN connection using Cisco ASA 5510 firewalls. One end is managed by me, the other managed by the remote location's IT, between the 2 of us is another party who manage and route the connections.

Remote desktop has been working fine with no problems then recently I noticed it was working for ONE server over the VPN which it previously had done. All the routes seem fine and I can still ping the remote server and even download files from an FTP site on the remote server.... so the VPN seems fine.

Remote Desktop works fine to the remote server within the remote location but not over the VPN. I don't understand why it's stopped working, I originally thought it was a rule in place by the other party but they stress it's not them.

The only thing that has changed on the server initiating the RDP connection is that it now runs file services sharing a folder. The source server (remote location) may or may not have had updates applied.

Any idea's?