I noticed that if a user logs out after a CoA packet is sent for a user and before the CoA request actually succeeds, the router will report “Radius CoA failed: user logged out” (which is the truth) but the queue associated with that session won’t be deleted and the next time the user tries to log back in, there will be an error: failed to add queue: already have such name (6)
The CoA request is supposed to set a new traffic rate limit (using the Ascend codes) to a user, and I’m using this for Hotspot. However, it’s worth checking if the same happens to PPPoE servers under the same conditions. I’ve reported this as the code SUP-100186, for MikroTik staff to see