Does this support doc have a typo? It refers to port 1443 for the default instance, but then recommends 1433.
Cause
The connection string does not use the correct port for the default instance (1443) and so it fails to connect.
Resolution
The Data Source can be configured to use port 1433 without the requirement Database Instance Name.
Leave the Database Instance Name field blank, so that the default value of MSSQLSERVER will be used.
Then, fill in the port 1433 to be used.
