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Outbound Terminal Services failing... - 12.Mar.2007 8:42:46 AM

Daniel Johnson

Posts: 1
Joined: 12.Mar.2007
Status: offline

Ok, this is beginning to drive me insane.

I have recently deployed ISA 2000 within our office environment as the primary firewall and web proxy. Apart from a few niggles, it's going great. VPN clients aren't receiving DHCP details even though I've enabled DHCP relaying, but whatever, I'll figure it.

The thing that's driving me mad is this:

I'm having problems accessing remote Terminal Servers (which are incidentally behind no firewall and have no VPN capability) from machines within our network.

I've created a protocol rule to allow access to the RDP protocol.
I've created a site rule to allow access to the remote servers.

Other outbound services are working fine (I'm not a total lemon).

Using a Remote Desktop Connection from Windows XP machine on our internal network, I can superficially connect to the remote servers. However, after the "Connecting..." dialog box completes, the terminal window opens as a black screen, which times out with:

"Your Remote Desktop session has ended.
The connection to the remote computer was lost, possibly due to network connectivity problems. ... Blah."

Pre-ISA, I could connect with no problems through a hardware router. I'm assuming I need to enable another protocol, or edit the RDP protocol that comes with ISA 2000 to include additional ports etc.

Any ideas? Thanks in advance for any help!

Danny