This Counter64, in HTTP Protocol Data Units, counts PDUs detected containing HTTP methods disallowed by local security policy, and requires the firewall to be performing deep packet inspection of HTTP traffic, accumulating since the last reboot. An admin uses it to catch clients using HTTP verbs the policy has decided to block, such as unusual or risky methods. A spike in this counter would prompt an admin to check whether a client is issuing disallowed HTTP methods, whether by misconfiguration or by design.