Article ID: 925634 - Last Review: November 27, 2007 - Revision: 1.9 Error message when you try to log on by using an account name that contains an "at" sign (@): "The system could not log you on"SYMPTOMSWhen you try to log on to a Microsoft Windows-based computer by using a user name that contains an "at" sign (@), you receive the following error message: The system could not log you on. Make sure your user name and domain are correct, then type your password again. CAUSEThis problem may occur if the following conditions are true:
During S4U Kerberos authentication, the UPN name is parsed from left to right until the first "at" sign is found. The "at" sign acts as a delimiter between the Active Directory directory service logon name and the domain name. When a logon name contains the "at" sign, only the part of the Active Directory logon name that is to the left of the "at" sign is used during authentication. WORKAROUNDTo work around this problem, remove the "at" sign from existing SAM account names.
Verify that the "at" sign is not used in new SAM account names for user, computer, or service accounts. STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. MORE INFORMATIONFor more information about how to troubleshoot logon and authentication problems in Microsoft Windows Server 2003, visit the following Microsoft Web site: http://technet2.microsoft.com/windowsserver/en/troubleshooting/logauth.mspx
(http://technet2.microsoft.com/windowsserver/en/troubleshooting/logauth.mspx)
For more information about logon methods and authentication methods for Microsoft Windows XP Professional, visit the following Microsoft Web site:http://technet.microsoft.com/en-us/library/bb457114.aspx
(http://technet.microsoft.com/en-us/library/bb457114.aspx)
For more information about how to troubleshoot logon problems in Microsoft Windows 2000 Professional, visit the following Microsoft Web site:http://technet.microsoft.com/en-us/library/cc977287.aspx
(http://technet.microsoft.com/en-us/library/cc977287.aspx)
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