This is the numeric error code from the last remote operation this FSM workflow attempted against the endpoint's management controller. For this chassis slot endpoint, rmtErrCode is what an admin checks first when this workflow stalls, to see whether the blade's own controller actively rejected a request rather than the fabric interconnect simply timing out. A nonzero value here (versus the '0' seen on healthy runs) tells an admin the remote side returned a specific fault that's worth looking up rather than a generic timeout.