A port is an unique identifier for a network service which runs on a computer. By default the first Channel administered by just:connect uses port 5519. Additional Channels use the ports 5520, 5521, 5522 and so on.

• Each Channel must have a different port number assigned. Using the same port number (for two Channels or one just:out engine) on the same machine will result in an error.
• If you are not sure whether a port is used on your network, please consult your network administrator.