Problem:
While adding secondary replica to AlwaysOn Availability group you get following
error
TITLE: Connect to Server
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Cannot connect to REPLICASERVER.
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ADDITIONAL INFORMATION:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 5)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=5&LinkId=20476
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Cannot connect to REPLICASERVER.
------------------------------
ADDITIONAL INFORMATION:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 5)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=5&LinkId=20476
Solution: Most
likely Named Pipe provider for SQL is disabled on secondary instance
Open SQL Server Configuration Manager and click on Protocols
for MSSQLSERVER under SQL Server Network Configuration
Enable Named Pipes provides
Restart SQL Services
Then try adding the replica again in New AlwaysOn Availability Group Wizard
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