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Legacy SharePoint troubleshooting - Windows SharePoint Services 3.0 / SharePoint 2007 era

This article documents an authentication-related error encountered in an older SharePoint farm environment.

The error involved NT AUTHORITY\ANONYMOUS LOGON and was recorded in the Windows event logs as Event ID 3351.

The troubleshooting information below is retained as a historical technical reference for administrators supporting legacy SharePoint installations.

Note: This article does not apply directly to SharePoint Online. Authentication, service accounts and database connectivity are managed differently in Microsoft 365.

Event Type: ErrorEvent 
Source: Windows SharePoint Services 3
Event Category: Database
Event ID: 3351
Date: 9/28/2010
Time: 12:06:00 PM
User: N/A
Computer: WFE2
Description:SQL database login failed. Additional error information from SQL Server is included below.
Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp

I did some research and it turned out the error occurs because "Windows SharePoint Services VSS Writer" service in that SharePoint box was running "Local System". I changed this to a domain service account and the error vanished.
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