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Critical Error: Cannot Connect to SQL Server. {SQL Server} not found. Timeout expired.

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Greetings,

I have been having some issues with various areas in a SharePoint 2013 farm.  While working my way through a bazillion errors in the event logs, I have found the following error.  It looks to be happening every hour; almost exactly 5 minutes after every hour.

"Cannot connect to SQL Server. A_PROD_SP01 not found. Additional error information from SQL Server is included below.
Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding."

I also find, a health analyzer rule that is failing at the same time:

Availability: One or more servers is not responding.

However, there isn't any server listed in the Failing Servers section.

Any thoughts?

Thank you,

Bob


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