In the picture above the address bar has http://www.google.com in it. Just replace all of that with the internal IP address of your router. By default the IP address should be set to 192.168.1.1.
You should see a box prompting you for your username and password. Enter your username and password now.
Click the Log In button to log in to your router.
Please visit our Default Router Passwords page if the username and password shown below did not work for you.
If you can't login to your router because you forgot your router username and password, use our How to Reset a Router Password guide to set your router back to its factory settings.
Click the Advanced link near the top of the page.
The menu on the left should change. In this new menu, click Firewall Settings.
Remove the checkmark from the Enable Attack Prevention checkbox.
Remove the checkmark from the Prevent IP Spoofing checkbox.
When you're finished, click Apply near the bottom of the screen to save your changes.
And that's it! You're done!
To test if your port has been properly opened, you can use our Port Checker tool.
Didn't find the screenshot you were looking for? Check our our giant collection of router screenshots.