Known problems updating zywall firmware
(Of course many routers are different, some are very advanced and others are rather simple) Here is an example from a router from Verizon and its firewall options.
As you can see if it is set any higher than minimum security that all the inbound policies (the port forwarding rules) will be rejected and port forwarding wont work.
Other times people may want to make a port forwarding rule for their PS3 or Xbox and put the wrong IP in as well.
To make sure the port forwarding rule is working correctly, the IP address of the rule should point to the computer, or machine, you want the connection to go to.
Firewalls in Windows, Linux & Mac I have also found that some home users don't realize they have a firewall installed in the first place.
A lot of the antivirus packages out there come with built in firewalls as part of the antivirus.
So users think they have antivirus but don't realize it is also a firewall.
So when a warning pops up about a program trying to connect to the net they seem to like to hit block by default, thus breaking things more than helping.
In cases like this the only real reason to have a software based firewall installed is to block programs from connecting to the net. "Most online port testers fail no matter what if nothing accepts their connection attempt.This port tester program will open the port on the system it is running on and listen for a connection from this site. Depending on which router the person has (Some routers are easier than others at setting up port forwarding rules) it can be easy to setup, but not easy to get working. of Pc Win Port forwarding can sometimes be a rather big pain in the butt.