Hi, basically a port open is a service or an application listening on it, binded to it. So to close a port, you have to close the associated application/service. If you can't close it (used for instance by required services), use a firewall to block accesses to it. regards, gkweb.
The Outpost forum FAQ Online Scans - What to do with Open and Closed Ports has plenty of information which should be of help, whatever firewall you run.
