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SQL 2005 server in Clustered Instance I find while system is restarted SQL server is not connecting due to VIA Network protocol

Cause for the  SQL Server failed to initialize VIA support library [QLVipl.dll]. This normally indicates the VIA support library does not exist or is corrupted. While troubleshooting found that problem is with the SQL Client Network protocol problem, where Ive to disable the VIA network protocol and restarted the SQL agent Service.

What would be the cause why this is happenning on SQL clustered synario in ACTIVE/PASSIVE ?
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Jim P.
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but what is the cause for SQL Server database engine could not start ? why SQL Server failed to initialize VIA support library [QLVipl.dll].  Why this problem comes on SQL clustered 2005 server.

and we need to disable VIA network protocol. Should we be concerned about this happening in the future or or was it a one-time incident?
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As you mentioned it is one time Occurance. I need again disable the VIA protocol and start sql agent to connect the SQL database.

Can you please suggest what is the permanent resolution SQL agent should not stop with VIA network protocol which is showing enabled even after i disballed mannually and restarted the SQL agent.

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