A few days ago at work, I went to connect to a headless server at work, and it indicated that I couldn’t connect because all the Terminal Services connections were in use. What now?

There are graceful ways around the issue. You can (a) Reset one of the connections remotely, freeing up room for you, or (b) Connect to the computer’s console session and then reset the sessions from a GUI interface.

Resetting connections remotely. This method is more graceful, but requires a bit more work. As Scott Forsyth described in Managing Terminal Services Sessions Remotely, the qwinsta (query windows station) and rwinsta (reset windows station) commands can help you accomplish this.

Use qwinsta to find a session to clear, or reset:

C:>qwinsta /server:MyServerName
SESSIONNAME USERNAME ID STATE TYPE DEVICE
0 Disc rdpwd
rdp-tcp 65536 Listen rdpwd
console 5 Conn wdcon
rdp-tcp#59 MyUserName 2 Active rdpwd

In this example, “MyUserName” has a session, and I could clear that session to take it’s place. To do that, I would use rwinsta to clear the session, which has an ID of 2:

C:>rwinsta 2 /server:MyServerName /V
Resetting session ID 2
Session ID 2 has been reset

With the session being reset, I could now successfully login with Remote Desktop.

Connecting to a console session. Windows will always have a console session, which is the session that represents the session outputting to the physical monitor, if one were plugged in. If a user were logged into the machine and physically using the mouse, keyboard, and monitor that are plugged into the machine, and you then connected remotely to the console session, their session would be disconnected and you would connect to that console session. Obviously, this is not the typical approach you would want to take, but it is an option when you need to force yourself onto the computer.

Basically, this is accomplished by running Remote Desktop from the command line (mstsc) and invoking the command line argument to connect to the console session.

mstsc -v:MyServerName -console

That’s all there is to it! At that point, you can either proceed with your work or use the console session to clear any other Terminal Services sessions in the Terminal Services control panel.