Event ID 3351-Login failed for user ‘NT AUTHORITY\ANONYMOUS LOGON’
Today 01/04/2011, as part of my monthly checks, I noticed a whole bunch of 3351 errors in the event log on the SharePoint front end web server.
Event Type: Error
Event Source: Windows SharePoint Services 3
Event Category: Database
Event ID: 3351
Date: 1/4/2011
Time: 12:44:45 AM
User: N/A
Computer: MOSSSERVER
Description:
SQL database login failed. Additional error information from SQL Server is included below.
Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'.
Resolution: First I started to check the application pool account of the portal site and found they were all set as defined. After a thorough investigation found that the Windows SharePoint Services VSS Writer account is running as local system account. Changed the account to the AD Farm Account and found that the issue is resolved.