I have a loan 2012 server acting as a session host.
The server allows 1 user to connect, but for each subsequent user the connection hangs on "Configuring remote session" and eventually fails with "The two computers couldn't connect in the amount of time allotted"
When the logged in user logs out, another user can log in, but only 1 at a time.
This happens regardless of the source of the connection. The server has no firewall or AV installed presently.
The event log shows the connection is established but its as if the server does nothing with it afterwards.