View the status of the underlying firewall

In the Control Panel top menu, click Products → Dedicated Servers → Basic Firewall section.
Open the firewall page.
Look at the status of the firewall in the upper right corner.

INACTIVE	The firewall doesn't have any rules
APPLIED	List of rules activated
PENDING	The list of rules is not activated
PROCESSING	Changes are applied to the firewall
CLEANING	The firewall is being removed
ERROR	There was an error, create a ticket