Happened to me hence jot down here for future reference, perhaps helpful to you also 🙂

Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host localhost, port 1433 has failed. 
Error: "Connection refused: connect. 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.

Try to configure the TCP port as below from Sql Server Configuration Manager:

Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user 'xxxx'. 
ClientConnectionId:4ff4b2b5-ffda-47fb-9a03-ca8cfc6cca6b

Try to configure as below from Microsoft SQL Server Management Studio: