MySQL not in the default port

Hello, I had to install my MySQL not in the default port (3306), and I'm not able to connect to the server ... I tried everything in the sql.conf like localhost:5999, my.IP:5999, hostname, etc and nothing makes it to connect ... Is there any (right) way to specify a port to connect ? is it possible ? P.S: I tried to make FreeRadius to connect to an outside MySQL server (standard port) and it connected without problems ... Thanks in advance,