The ENS Web Control block and allow policy lets users enter patterns of URLs. Users aren’t restricted on the number of entries made in the policy. After entering a large number of patterns in the policy, the policy is no longer able to save or be edited.

As a mitigation effort, some users might have attempted to modify the ePolicy Orchestrator (ePO) server maxpostsize to "-1" to accommodate larger policies. After modifying maxpostsize, the ENS Web Control policy can still become too large for the ENS Web Control extension to process. The maxpost configuration change allows an undefined amount of data. McAfee Enterprise can’t estimate when that data size will become too large to process the policy.