I'm relatively new to server administration. I'm having a problem with server logins from the Windows 7 desktop.
Up until recently, Windows 7 logged users onto the server automatically. But for the past few weeks, users have been intermittently getting a login dialog saying that the system had detected an attempt to breach security. The dialog has the usual user name and password boxes, so we have simply been logging in manually when that happens. Suddenly, users aren't getting a login box at all. They are getting an error message saying their user name is not recognized, with no boxes for entering user credentials.
Can someone tell me what's going on? Any suggestions where to look to learn more about this problem? Thanks.