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https://rancher isn’t a FQDN, the search domain necessary to resolve that is unlikely to be set within the rancher agent pod. I would recommend using a FQDN (rancher.my.domain). Confirm that it will resolve using whatever DNS server your pods are using.

Hi @creamy-pencil-82913 I tried adding FQDN as well, but it fails to connect , although port 443 is open for the connection and using curl https://rancher/ping gives a response as pong

What do you mean adding fqdn? Did you re-run the registration command with a fqdn for the rancher server address? Short hostnames are highly unlikely to work properly.

yeah I did run the registration command