Hummm, so where is the - I'm a dork" section? :-)

[arion_p]

They also have the same public port which actually IS the issue. The router has no way of knowing which rule to use when connecting from the outside to port 80. Furthermore, some ISPs block port 80, so using another port will solve both issues. Finally there is a source ip address. I don't know what exactly this means but I guess it probably only accepts connections from that address (which is a private address and would never be routed by the ISP)