You might have the "Always prompt for password" setting checked in the server's Terminal Services Configuration settings. Under "Connections", right click the "RDP-Tcp" (by default) connection and select "Properties". The setting is on the "Logon Settings" tab. Here's a picture on one of my servers: ![]()
edited by robbinsd on 12/11/2014
edited by robbinsd on 12/11/2014