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Don't know if the following info could help the developers solving the issue:
If I connect via VPN to my network from outside, the involving PCs (which are not capable of running the host, so that a client can cannot without the error message) cannot be called by their windows' hostnames! IP only.

It's working :-)
There was a problem some hyper-V ethernet adapter in the host.
When I disabled these adapters, the viewer logged in.

After checking the whole network setup I can tell you, that this error was indeed caused by an error on my side. I just found out, that my DSL modem from one of the biggest providers in Germany does not give you an IPv4 address as long as you don't pay for it. Even the router's not capable of portforwarding - d'oh!

So thanks a lot, I will always recommend your wonderful Remote Administration Tool!

I am the same issue: "This authentication method is not enabled in remote Host settings".

# Configuration

Remote PC with Agent. It is connected to Public server.
Local PC with Viewer. It is logged in to Local RU server.
The Server's Rubrica contains item to the Remote PC. The configuration is both equals: same server (public), same authentication methods.

# The issue

When I try to connect to Remote PC, the Viewer show me a message box: "This authentication method is not enabled in remote Host settings".

# The skip issue method

- Do "Log out" to Local RU server
- Retry to connect.

# The connection LOG with ISSUE

19-11-2025__00:22:29__535 Check ID Connection. Connecting...: "private-ru-server.com:5655".
19-11-2025__00:22:29__536 Check ID Connection. Connecting...: "id75.remoteutilities.com:5655".
19-11-2025__00:22:29__537 Check ID Connection. Connected...: "private-ru-server.com:5655".
19-11-2025__00:22:29__556 Check ID Connection. Request MsgTransportThread.Send. Host: "private-ru-server.com:5655".
19-11-2025__00:22:29__650 Check ID Connection. Connected...: "id75.remoteutilities.com:5655".
19-11-2025__00:22:29__867 Check ID Connection. Request MsgTransportThread.Send. Host: "id75.remoteutilities.com:5655".
19-11-2025__00:22:30__530 Check ID Connection. After process message. Host: "private-ru-server.com:5655". MsgCode: 10
19-11-2025__00:22:30__625 Check ID Connection. After process message. Host: "id75.remoteutilities.com:5655". MsgCode: 10
19-11-2025__00:22:30__780 Check ID Connection. Exit: "private-ru-server.com:5655".
19-11-2025__00:22:30__887 Check ID Connection. Exit: "id75.remoteutilities.com:5655".
19-11-2025__00:22:35__347 Connection #323360. Connection to "Xilium RU serverFSPEZI-XP-PRO". Mode: <Authorization>. Connecting...
19-11-2025__00:22:35__348 Connection #323360. Direct connection to Xilium RU serverFSPEZI-XP-PRO (192.168.23.119:5650).
19-11-2025__00:22:35__350 Connection #323360. Connection to "Xilium RU serverFSPEZI-XP-PRO" established. Mode: <Authorization>.
19-11-2025__00:22:35__350 Connection #323360. Connection to "Xilium RU serverFSPEZI-XP-PRO". Security check - OK. Mode: <Authorization>.
19-11-2025__00:22:40__870 Context #323360 removed. Mode: <Authorization>.

Thanks for your support.

Viewer version: 7.7.3.0
Viewer OS: Windows 11 (last version)

Host version: 7.7.3.0
Host OS: Windows XP

Host / Security: "Single password security" (no password)
Viewer / Security: no options

Viewer / Authentication method: "auto"