SERVER SET PORT

Usage: SERVER <name> SET PORT <number>

This is the default port your server will use when it tries to connect to another server. The port you choose must be one that is defined on the other server.

Example:
/as server ChatNow set port 7300

You will usually want to use a port that you are not using for anything else. But so long as the two servers are configured to connect using the same port, it should work.