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Sharepoint Event 5586 Error

An installation of SBS 2011 started showing the following Event error (and Company Web stopped working):

Sharepoint Foundation Event 5586

Unknown SQL Exception 1346 occurred. Additional error information from SQL Server is included below.

A transport-level error has occurred when sending the request to the server. (provider: Shared Memory Provider, error: 0 - Either a required impersonation level was not provided, or the provided impersonation level is invalid.)

There are various suggestions on the web for fixing this error.  In the case of this server, the solution was simple.  In Internet Information Services (IIS) Manager, Application Pools, one of the Sharepoint Application Pools was Stopped.  Starting it again solved the issue.  Why the Application Pool stopped in the first place is not known.