If there is ERROR in the Firewall status column, this means that the Firewall cannot start at all because an error was encountered when compiling the protection configuration. To view the details of the compilation error, click on the status to go to the Protection tab.

The example screenshot shows the Firewall column from an API collection page. The collection has six APIs that showcase the six possible statuses for the firewall instance: active, active with a failed configuration attempt, error preventing the firewall from starting, inactive but configured, not configured, and inactive but configured with a failed configuration attempt.

View the API Firewall configuration status
/Tasks/manage_protection.htm#View