Gaming Ports to open for NAT?

[Prime]

This is strange, I've enabled UPnP on my router but i still get a NAT error when i go online and play halo 3. I can find players fine but sometimes I cant join other games because of my Moderate NAT

I've resorted to opening ports but i can't find what ports I have to open...

Any help available from fellow 360 owners?

 

[Prime]

Nevermind.

I found this and opened those ports. It worked.

A Staff member can now close this. Problem solved