Hello Steinbach, Tim,
The error you are seeing with Remote Desktop “Your computer could not connect to another console session on the remote computer because you already have a console session in progress” with code 0x708 is related to Windows for Business environments, since it involves Remote Desktop Services and console session handling.
This error occurs when you attempt to connect to the console session (/admin or session 0) of a remote Windows system while another console session is already active. In practice, it means that either you or another administrator is already logged in interactively to that server, and RDP is refusing to open a second console session. Unlike normal RDP sessions, the console session is unique and cannot be duplicated.
To resolve this, you should avoid forcing a console session unless it is required. If you are using mstsc /admin, remove the /admin switch and connect noỏmally, this will create a standard RDP session instead of trying to attach to the console. If you do need console access, you must first log off the existing console session on the remote server, either by physically accessing it or by using query session and logoff <sessionID> from another administrative RDP session..
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
Domic Vo.