During canvas planner installation (multi-server installation), error occurred: 

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.

Cause: SQL port number is not allowed in firewall.

Solution: Find the port number 50290 and make it allowed in firewall on application server and sql server.