You need to specify the right network port to enable/disable network access for a program with your firewall.
Paul W. Frields
stickster@gmail.com
Rodolfo Ribeiro Gomes
rodolforg@gmail.com 2011

# Commonly-used network ports

This is a list of network ports commonly used by applications which provide network services, like file sharing or remote desktop viewing. You can change your system's firewall to block or allow access to these applications. There are thousands of ports in use, so this table isn't complete.

Port | Name | Description
--- | --- | ---
5353/udp | mDNS, Avahi | Allows systems to find each other, and describe which services they offer, without you having to specify the details manually.
631/udp | Printing | Allows you to send print jobs to a printer over the network.
631/tcp | Printing | Allows you to share your printer with other people over the network.
5298/tcp | Presence | Allows you to advertise your instant messaging status to other people on the network, such as "online" or "busy".
5900/tcp | Remote desktop | Allows you to share your desktop so other people can view it or provide remote assistance.
3689/tcp | Music sharing (DAAP) | Allows you to share your music library with others on your network.