This is the destination-side counterpart to lportSmdsCntSrcIaScrnFails, counting instances where a PDU's destination individual address failed the screening policy, meaning the sender is trying to reach an address they are not authorized to send to under this port's closed-user-group rules. An admin uses it to catch legitimate customers attempting to reach a peer outside their permitted group, often the sign of an access-control policy that needs updating rather than a fault. For example, a customer newly onboarded to a business partnership might get blocked here until the admin adds the partner's address to the appropriate allowed-destination screen map.