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after gone through several time try and errors, some findings here: 1. this error seems random, and retry the same setting with several time would work. 2. during installation, you may encounter some error saying hostname is duplicated

Waiting to retrieve agent configuration; server is not ready: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"

, you have to delete secrets with hostname under kube-system namespace. the secret is with the name

<node-name>.node-password.rke2

. then the node init process would register itself. 3. if

GET to <https://127.0.0.1:6444>

are timeout or cancelled, try reboot the node.