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Login failed for user NT AUTHORITY\ANONYMOUS LOGON

I saw that this error was appearing multiple times on my SharePoint front end server:

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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