|Run the following command at your Command Prompt...|
Take note of what your Default Gateway is. Then type that IP address in a Web Browser like IE. If you forgot your admin password for your router, you may need to rest it to factory and use the password in the instructions that came with your router.
Once you are in then you need to know what ports need access on your Vudu box. Go into the firewall settings of the router and setup port forwarding for those ports to the IP of the Vudu box.