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Click Add to firewall rules to add the rule to the end of the list of rules.
Click Save after you have added or edited a rule to activate all changes.
Click Cancel to discard all changes made after the previous save.
6.3.3 Network Services
The Network Services page displays the network services that currently
exist in the system. When you want to enable or disable the use of a
certain service, you have to make sure that the service exists in the
Network Services table. After that you can create a firewall rule that
allows or denies the use of that service.
To add a new service, click Add new service below the list of services.
To edit a service, select it from the list of services.
Direction For every service you selected, choose the
direction in which the rule applies.
in = all incoming traffic that comes to your
computer from the internet.
out = all outgoing traffic that originates from your
computer.