Information
This policy setting determines whether the account name of the last user to log on to the client computers in your organization can display in each computer's respective Windows logon screen. If you enable this policy setting, intruders cannot collect account names visually from the screens of desktop or laptop computers in your organization. An attacker with access to the console (for example, someone with physical access or someone who is able to connect to the server through Terminal Services) could view the name of the last user who logged on to the server. The attacker could then try to guess the password, use a dictionary, or use a brute-force attack to try and log on.
Solution
Configure the following Group Policy setting in a manner that is consistent with the security and operational requirements of your organization-
Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Interactive logon- Display user information when the session is locked
Impact- Users will always have to type their user names when they log on to the servers.