Hello,
I need to connect to an external database (sql server 2016) i create a new datasource and i got an error 
The TCP/IP connection to the host mydbhostname port 1433 has failed. Error: “Connection refused: no further information. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.”.
(With my CF server if leave blank the port and it works)
I’ve tried with Oracle driver it works
Thx for the help
Marc