How unblock ports

[Mockers]

Hi
im new to debian...make that linux... i just installed apache etc and i can access it from my local network, but not from outside my network. My ISP doesnt block ports 80, as many of the forums i have looked at have suggested, i have forwarded the port on my router, and i cant find any documentation on how to unblock ports in debian... so i guess thats where ill start.

How do I unblock ports in Debian?
(note: explain like your explaining to a 3 year old)

thanks in advanced
teh mockers

[slash12345]

First, check your iptables rules and policies. You can do that by typing as root:
iptables --list
If you see any blocked ports, remove them from the list (check iptables manual for that, it's been a long time since I last used it).
The common problem is that people don't forward the ports properly (your router may have a hardware firewall). Please double-check your configuration.

[boggy]

Use iptables just like slash instructed then in your browser 192.168.1.1 check your system configuration in your router to make sure you have them forwarded properly.