This gauge holds the numeric error code returned by a remote call the FSM workflow tracked by the finite-state-machine object that drives a physical port's own workflow (such as a re-discovery cycle) from start to finish made and that failed. An administrator troubleshooting a failed workflow on this PhysFsm instance looks up rmtErrCode against Cisco's error reference to identify the exact cause rather than guessing from a generic failure state. For example, a nonzero rmtErrCode on this PhysFsm instance is what the operator would quote when opening a support case about a stuck port workflow.