SQL Server connection failure errors can include the following:
"Monitored Server - SQL Server Connection Failure Cannot connect to SQL Server instance '<instance_name>' : Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. : The wait operation timed out [0xFFFFFFFE]"
"Monitored Server - SQL Server Connection Failure Message: "Cannot connect to SQL Server instance '<your_instance>' : 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) [0x80131904]"
"Monitored Server - SQL Server Connection Failure Message: Cannot connect to SQL Server instance '<your_instance>' : A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)"
"Monitored Server - SQL Server Connection Failure: Connection does not exist"
"Login failed for user"
"Timeout expired"
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