Which ACME validation method is most reliable for Proxmox VE clusters with split-horizon DNS?
Proxmox VE utilizes the pveproxy service to handle ACME Let's Encrypt certificate automation, typically relying on HTTP-01 validation via port 80. For cluster environments, the node name must align with the certificate Subject Alternative Names (SANs) to ensure seamless web UI access and API communication across all members. In scenarios where split-horizon