This is a 64-bit counter, accumulated since the last reboot, of connections for the specific protocol denoted by cufwConnProtocol that were abnormally terminated after having been successfully established. An admin uses this to catch a specific protocol whose sessions are being cut short after connecting, distinct from that protocol's setup failures. For example, a climbing value here for one protocol while its setup-abort counter stays low would indicate established sessions of that protocol are being disrupted mid-flow, not failing to start in the first place.