Applies To:
  • CitectSCADA x.x

How can I bypass the Windows NT security check and automatically logon? 

You can skip the Windows NT 3.51 and 4.0 security checks by editing the registry using Regedt32.exe:


Add the values:


If automatic logon fails, due to a typo or a blank password, Windows NT resets to AutoAdminLogon:REG_SZ:0.

Note you may need to run User Manager (Musrmgr.exe) and set Password Never Expires. If you need to logon as another user with different privileges, then you hold down the SHIFT key at startup and the login dialogue will be displayed. Beware after logging on as another user, the next automatic logon attempt will fail as it will try to login as the other user but will use the password for the auto logon user as specified in the registry. You can simply type in the details for the auto logon user when the logon fails or if you wish you can make the registry key read only so that the other users details never get saved in the registry. To do this select the "WinLogon" key in Regedt32.exe and then select Security - Permissions. Now change the Type of Access for all the displayed accounts to "Read"