what is wrong i installed on a server 2012 foundation the teamviewer as a Host. I only can connect and see the Server under "Computer & Contcts" wenn someone is logged in. I lost the connection again when I log out.
This error is often related to connecting to a server operating system with terminal services activated.
On a server OS, there is always a server ID, additionally each user profile will have a unique user ID. If you connect to the user ID rather than the server ID then this message appears if there is no active RDP session into the specific user (or it is minimised). The user ID is only online when there is an active RDP session as otherwise the server would not generate a desktop and hence there is no screen for TeamViewer to grab.
In most scenarios it is the server ID which is where users want to connect into. The server ID is always online and accessible. It can be found during the connection by the following: (Full version) Help > About (Host) right click icon in system tray > About TeamViewer or by clicking on the blue light.
I hope this could help. If not, do not hesitate to contact us again.
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