Cert error on Rancher UI after 1 year (Rancher UI 2.2.1)

Hello Everyone,

I installed rancher on single node from rancher UI 1 year ago.

Actually I can’t open Rancher UI because certificate inside /opt/rancher are invalid.
The k8s cluster run but can’t acces from rancher UI.

It works again if a change date of linux machine.

I show in my container k8s_agent_cattle-node**** an error apour bad TLS certificate from Rancher UI.
My rancher UI certificate is expired, how can I update it (I use self signed certificate)

Thanks a lot.

Best regard.