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Windows RDP client not connecting to Remote Desktop Gateway with Loadbalancing

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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  • Hoi Marc and welcome to the UTM Community!

    Do you learn anything from doing #1 in Rulz on both UTMs?

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • Hoi Marc and welcome to the UTM Community!

    Do you learn anything from doing #1 in Rulz on both UTMs?

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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