Hi all,
I have a problem connecting the Windows RD Client (mstsc.exe) to a remote desktop gateway behind port 443.
Remote server
Sophos UTM 9.5 (NAT forwarding port 443 to TSGW)
TSHOST01
TSHOST02
TSGW+BROKER
Client 1
Draytek Router
Windows 10 workstation
Client 2
EdgeRouter Pro
Windows 10 workstation
Client 3
UTM 9.5
Windows 10 workstation
Connection remotely to de RD Gatewayserver from client 1 and 2 does not give any errors and works as expected. All sessions are loadbalanced over TSHOST01 and TSHOST02. Connecting from Client 3 I get an error saying the RDClient (mstsc.exe) cannot verify that TSHOST01 or TSHOST02 is part of the RD Farm. It seems to me that the UTM blocks something that is crucial for the RDClient. Unfortunately there is no logging in the firewall livelog to start troubleshooting.
I disabled all functions of the UTM on Client 3 except the Firewall with some incoming NAT rules and a rule to allow any traffic from internal network to the outside. This does not resolve the problem.
I checked from another client, same setup as Client 3. Same issue. I can safely say that the problem is somewhere in my UTM config on the client site.
Any suggestions how to troubleshoot?
thanx!
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