Firewall Not working?

Hi,
I am trying to secure my powerbook using the inbuilt firewall. My firewall is enabled and using the GUI i have only opened ports 22 and 9000.
However using nmap the following ports are open:
PORT STATE SERVICE
22/tcp open ssh
631/tcp open ipp
1033/tcp open netinfo
3689/tcp open rendezvous
6000/tcp open X11
18101/tcp open unknown
I copied down my ipfw list:-
02000 allow ip from any to any via lo*
02010 deny ip from 127.0.0.0/8 to any in
02020 deny ip from any to 127.0.0.0/8 in
02030 deny ip from 224.0.0.0/3 to any in
02040 deny tcp from any to 224.0.0.0/3 in
02050 allow tcp from any to any out
02060 allow tcp from any to any established
02065 allow tcp from any to any frag
02070 allow tcp from any to any dst-port 22 in
02080 allow tcp from any to any dst-port 9000 in
12190 deny log tcp from any to any
20000 deny log icmp from any to me in icmptypes 8
65535 allow ip from any to any
Why are all these ports open?

You are running nmap on a computer different from the one whose ports you are sniffing, aren't you? If you are trying to look at your powerbook's ports, don't run nmap on the same computer. If you do, you are seeing internal "loopback" ports being used by internal processes on your mac that are not visible to other machines.
So, if you are not running nmap on a different computer, do that and see what ports another computer's nmap says are open on the powerbook.
Regarding an explanation of your ipfw list, you might want to check this out for a basic explanation. Also, google ipfw os x.
(if you find that this solves your problem, or is actually helpful towards arriving at a solution to your problem, please consider clicking on either the "helpful" or "solved" buttons in the header of my post)

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