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if you delete the agent pod in the downstream cluster it'll get recreated

that not the problem the token is still wrong even if the pod will be recreate .... the communication between the agent and rancher does not work.

You didn't mention anything about an incorrect token. The error looks like a network issue that might have been transient (lost wifi connection), and deleting the pod would let it reinitialize from fresh and might clear the connection error. If that's not the case, then something else network related is going on and you should troubleshoot that first. Can the cluster reach the rancher manager URL via curl in a debug pod?