I am only able to access a Hyper-V server from the Hyper-V Manager on the physical host. When the connection is established, I can use MSTSC from my local Windows 11 machine to connect to the server and take control of the session. However, if I attempt to connect directly to the server, I can log in, but the connection is dropped.
The issue appears to be caused by the Sophos Endpoint Agent. Upon uninstalling it, the problem is resolved. I have not been able to find the appropriate configuration for Sophos to solve the issue. I have discovered that changing the firewall settings works on one server but not on another.
How any cores does the server you are connecting to have? I assume it has one CPU assigned. Try giving it 2 and retry.