Question : RDP Though Proxy

Hi techs,

We are having a problem trying to access a remote desktop connection from a specific site.

We are trying to access a workstation at another site.  We can connect remotely via remote desktop at one site and it works fine but when trying to connect on the same laptop at another office it fails to connect and gives the following error.

"The client could not connect to the remote computer. Remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possible that network problems are preventing your connection. Please try connecting again later. If the problem continues to occur, contact your administrator"

At the problem site the laptop connects to a SBS2003 domain that runs ISA server as a firewall/proxy.  Internet access does not work at this site unless the proxy address is entered in IE.  I suspect that this is causing the issue and that the proxy is only allowing HTTP traffic.  Is there a way to configure ISA server to allow RDP.

I have checked the ISA settings at the problem site and there is a rule allowing inbound and outbound RDP connections to all users but it still will not work.

Any insights would be appreciated.

Answer : RDP Though Proxy

First, on the ISA - open the gui - select monitoring - logging - click start query.
Make the RDP access attempt. What do you see appear in the realtime log?
Do you see the RDP traffic arrive and then get denied? If so, what rule is denying the request - the default?
Does nothing appear in respect to the RDP request? In which case the block is happening before the traffic even arrives at ISA.