Make sure that you've entered a DNS server—if you haven't, you'll receive an error related to DNS and you won't be able to access any webpages. You can enter Google's free server with "8 8 8 8" or "8 8 4 4". If you use Comcast, enter "7 5 7 5 7 5 7 5" or "7 5 7 5 7 6 7 6".