This counter counts the number of ReKey Number (RN) mismatches encountered while the WDS authenticates a Mobile Node during Fast Secure Roaming. Because RN is used to keep the client and WDS synchronized on which key generation is current, a growing mismatch count suggests clients are roaming with stale or out-of-sequence rekey state. For example, an admin troubleshooting occasional reauthentication delays on a fast-roaming voice client fleet could watch cwdsiRnMismatchCount to see if key-generation mismatches are the root cause, keeping in mind the counter clears on WDS reinitialization.