RDP-sessions are beeing terminated after a few seconds when opening them over DVLS in webbrowser

Hello members of the Devolution community,

One of my DVLS-users reported to me that RDP-sesstions, which are opend in the Browser over our Gateway-Farm, are beeing terminated after a few seconds. I was able to reproduce this issue under my user as well. We also tried different RDP-sessions as well with the same result. Then i tried the same session under my DVLS-admin-user and the issue didn`t occur. I also tried it the other way around. I gave the reporting user also administrativ Permissions in DVLS an the issue didn`t occur.

I also looked into the logs on the DVLS or the Gateways and unfortunally i wasn´t able to find any hints on what was going on. I am only getting this error on the Gateways, when the Session is terminated:

2025-12-03T06:26:14.049288Z ERROR listener{port=7171}:https{client=<ip DVLS>:56863}: devolutions_gateway::listener: handle_https_peer failed error="HTTP server: error shutting down connection: an existing connection has been closed by the remotehost. (os error 10054)"

The reporting user also has access to the RDP-Manager (Version 2025.3.25.0) and there he can use the Gateway, with the same session, without any issues.

Here are our current system-information.

#DVLS-Server
4x vCPU-Cores
8GB RAM
Windows Server 2025 with November CU
DVLS 2025.3.10.0
.Net 9.0.11 - Windows Server Hosting
Microsoft Windows Desktop Runtime - 9.0.11 (x64)

#Gateway-Fram, consisting from two indentical server with the following specs:
4x vCPU-Cores
8GB RAM
Windows Server 2025 with November CU
Devolutions Gateway 2025.3.2.0
Microsoft Windows Desktop Runtime - 9.0.11 (x64)

Please take a look at this issue and if you need further information let me know.

Thanks in advance for the help!

Greetings from Germany,
Markus