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# kubernetes
a
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a
this message mean your ip-address is not a part of the Subject-Alternative name try to run your installation with the --tls-san ip-address option.
c
--tls-san is an option for K3s, it wont change the cert used by the ingress in front of your Rancher install
The real problem is most likely that you haven’t set the rancher URL properly in the configuration. It will tell agents to contact it at whatever you have configured as its URL. Did you perhaps start out with an IP, and then later add a DNS entry which you are using to access it, but forgot to update the config?