Configuring the filter and NAT policy
The filter and NAT policy groups a set of filter rules and NAT rules. The firewall uses a Block all policy by default, in which administrators of the firewall can access the administration interface and block all other connections.
When you configure your firewall’s filter/NAT policy:
Always save changes in progress by clicking on Apply.
Be careful not to enable incomplete or incorrect filter/NAT policies that may prevent your firewall’s administration interface from being reached.
Remember that the SNS firewall blocks traffic: any traffic that is not explicitly described in the policy will be rejected without being logged, even when this rule does not appear.