This holds the human-readable description accompanying the remote error code for this particular FSM run, explaining in words what the failed remote call reported. Where rmtErrCode gives a number to match against known TAC references, this description is usually specific enough for an admin to understand the failure without escalating. For example, this field might read something like 'peer port unreachable' for a run that failed because the far-end switch or device wasn't responding at the time.