TeamViewer asking for admin account on restart

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When I try to restart a remote computer via TeamViewer actions it pops up a little TeamViewer dialog asking me for an admin account. After putting in username and password and clicking OK an UAC message is displayed on the screen but not via TeamViewer. My TeamViewer session gets broken until the UAC message is confirmed.
The remote computer runs TeamViewer Host as a Windows service. Why is that dialog shown nevertheless?