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We see this series of logs in the AKS cluster agent on disconnects:

level=info msg="Connecting to wss://<Our Rancher Hostname>/v3/connect with token starting with xxx..."
level=info msg="Connecting to proxy" url="wss://<Our Rancher Hostname>/v3/connect"
level=error msg="Failed to dial steve aggregation server: dial tcp <Our Rancher public IP Address>:443: i/o timeout"
level=error msg="Failed to connect to proxy. Empty dialer response" error="dial tcp <Our Rancher public IP Address>:443: i/o timeout"