Can MySQL use port 3307?
MySQL (or most/all other processes) can listen on just about any port (0-65535) though ports below 1024 are privileged and require special permissions (usually root/admin). There is no difference in port 3306, 3307 or 8279 for that matter other than that 3306 is the default port for MySQL (google)
There are more ports, search Google.
