This is a new error in this environment when I tried to logon, SQL Server 2008 SP1 Standard Edition 64-bit running on Windows Server 2008 R2. The complete text of the error is: Error: 18456, Severity: 14, State: 11 Login failed for user 'DOMAIN\user'...
SQLServer-QA.net - Knowledge Sharing Network (SSQA.net)
Wed, Dec 8 2010
Filed under: Filed under: sql server, security, ssms, dba, error, login, information, windows server 2008, new features, uac, severity, 18456