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For certain features like Paypal or Facebook authentication certain web pages must be accessible before the user gets authenticated.
Best practice:
1. create an extra user role, e.g. www_free_access
Configuration > Security > Access Control > User Roles
2. add a policy
Configuration > Security > Access Control > Firewall Policies
(destination:www_free_access, service svc-http, svc,https, action: permit)
3. add domain names (Rule Type: name)
Configuration > Advanced Services > Stateful Firewall > Destinations