Hi, please open a new thread next time instead of digging out this old one.

There is some information to your question already in this thread.
If you don't have an entry in your /etc/services, you can try with the command (if available) "lsof" if you can see what uses this port. Also you can check with netstat -a for example if it is up and what status it has.
For blocking ports you might want to use a firewall; depending on your system on Linux you could use ipchains/iptables.