Port Numbers Used by Lion Server Services

Each Lion Server service has a standard port associated with it. For example, the default port for IMAP e-mail is TCP port 143. When used with SSL encryption, the default IMAP port is TCP 993. Some services have a range of ports. Web service defaults to TCP 8080, but has a range of TCP 8000–8999 that you can use.

A firewall blocks incoming traffic through software ports (settings identified by port numbers) and by port type: TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). A port can be open, which allows traffic to come through, or closed, which blocks traffic.

If you’re configuring a firewall that’s not on Lion Server, take a look at the list of the default port numbers used by Lion Server. You also use these port numbers if you’re doing port forwarding for an Internet router. Of course, a firewall on Lion Server also uses these numbers, but Server Admin lists Lion’s services by name, as well as the numbers, so all you need to do is select them.

Apple has a more extensive list of ports that Apple networking software uses.