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Did the find the documentation re: certificate rotation - unsure if that'd solve the issue and am slightly nervous about just trying it 🙂

Did you move them, or add new nodes? Server IPs are expected to be static for the life of that server in the cluster. You will probably need to delete the node from the cluster, clean up the files on disk, and rejoin it with its new IP address.

Thanks a lot - that did the trick!