In addition to setting the pre-defined rules, you should also have the ability to set your own custom services. You can then define anything that is not included in the services listbox. Once it has been saved, you should find that it then appears in the services listbox:
Hardware firewalls are generally pretty secure; you can visit any one of numerous sites that scan your PC for open ports to verify this. The biggest security risk often comes from the users of your network, as incoming services are only blocked if they originated from an external source. Preventing your network users from accessing objectionable content can enhance the integrity of your router and greatly cut down the chances of infection or dataloss.
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