Hi guys

I did an nmap on my RedHat 7.3 box last night and found a few ports to be open

Im at work at the minute so not sure of the port numbers but heres some of the services i have running on those ports:

smtp
sunrpc
kdm
listen
X11

Im still a newbie on Linux so im not sure what ports to close and how to do this manually!
Im still in the process of fixing my kernel, so im unable to install a firewall, either by compiling or installing the rpm, so any help would be great!

Any other info yous may need, that ive forgotten to add, to help me just ask

Cheers

r3b00+