Solution 1: The Quick Way
Turn your router on and off again. Ha! We know it’s the old IT solution but this will often solve the problem. If you use a wireless router and NAT setting keeps going from Open back to Moderate after a while, it may be worth checking the security on your wireless router, as it’s likely someone else is leeching from your connection. Set a password for it, at minimum.
Solution 2: The Long Way
If the turn-off-and-back-on trick doesn’t work, you have to do this the long way.
First of all, you need to find out the IP of your router. Connect to your router using your PC/Mac and go into Network Preferences > Advanced, open up DOS and type “ipconfig”. Note down the your IP number.
Now type your IP number into your internet browser. You’ll be asked for the name and password – if you don’t have these available, look up the default passwords for your router on Google (for example, Sky broadband is usually ‘admin’ for name and ‘sky’ for password).
Finally, when you access the router, you’ll have a whole host of options to go through. The one you want will make reference to DMZ and should have somewhere you enter an IP number. Enter the IP number into the relevant section of the DMZ tab and bingo! Open NAT and you can play online again.
