The new requirements for trusted certificates on macOS Catalina and iOS 13 blocked me from accessing the web UI on Proxmox installations (NET::ERR_CERT_REVOKED). Fresh installations would work, as Proxmox has been updated to generate “better” certificates. Existing installations, unfortunately, are not automatically fixed on upgrading to Proxmox 6.
Certificate management on Proxmox is handled with pvenode(1) — except when it isn’t. There is no functionality there for regenerating the self-signed certificates. An older wiki page for HTTPS certificate configuration provided some useful hints: pvecm(1) has an updatecerts command. It won’t, however, regenerate existing (unexpired) certificates.
Against the warnings on the Certificate mangement page I thought I’d try removing the apparently relevant files manually:
cd /etc/pve rm pve-root-ca.pem priv/pve-root-ca.key nodes/*/pve-ssl.{key,pem}
Then I regenerated the certificates and restarted pveproxy(8) on each node:
pvecm updatecerts --force systemctl restart pveproxy
Refreshing the page in the browser restores access to the web UI.