Instructions
Navigate to the "Settings" menu on your PlayStation 3. Select "Network Settings."
Select "Internet Connection Settings."
Select "Custom." Select your connection method. Select "Auto-Detect" followed by "Automatic" and "Do Not Set."
Select "Manual" for DNS settings.
Enter either "208.67.222.222" or "208.67.220.220" as your DNS numbers. Both are equally effective.
Select "Save Changes" to be returned to the main menu of your PlayStation 3. Connect to any online part of the PS3, such as the PlayStation Store. If you are able to successfully connect to any online portion of the PS3, this will confirm that the changes have been effective.