Known problems updating zywall firmware
Thankfully the routers that have the extra firewall options come with good information on the page about which setting you should use to allow port forwarding to work.
Normally you can just turn off the firewall or just put it at its minimum setting. A router is a hardware based firewall already, the firewall options in the router are simply more options to better control things if needed.
Some users have put internet IP's in or just the wrong IP all together (Such as putting their computers IP in when they want the IP from their Xbox).
So lets say I want to make a port forwarding rule that sends an incoming connection to my PS3.
Make sure to check for any firewall settings in your router to see if anything is set to block incoming connections.So when the port tester program says the ports are open you can count that they are :-)" The port tester is only for testing to your computer, not to other devices, because it has to open the port on the system to listen for a connection. Thankfully it is easy to get port forwarding if this is happening.So the port tester is of no use if testing say your DVR or something else other than the computer. Enter the IP you wrote down into the DMZ page and enable DMZ. We simply tell the first router to send all incoming connections to the 2nd router where the port forwarding rules are.Remember a router is a hardware based firewall, it blocks incoming connections except those allowed through by the port forwarding rules.In cases like this the only real reason to have a software based firewall installed is to block programs from connecting to the net.
Other times people may want to make a port forwarding rule for their PS3 or Xbox and put the wrong IP in as well.