diff --git a/group_vars/proxmox.yml b/group_vars/proxmox.yml
index f36c3b4..1f52c91 100644
--- a/group_vars/proxmox.yml
+++ b/group_vars/proxmox.yml
@@ -1,6 +1,9 @@
 ---
 # Proxmox-specific variables
 
+# Allow root SSH login with keys (required for Proxmox cluster inter-node communication)
+common_ssh_permit_root_login: "prohibit-password"
+
 # Disable firewall on Proxmox (uses its own iptables rules)
 common_firewall_enabled: false