Over half of VMmanager panels share port 443 with customer sites

Of 2,823 publicly reachable VMmanager interfaces, 1,592 answer on port 443 — the same port hosting providers use for customer websites. Blocking the port protects the panel but takes customer sites offline, so ISPsystem recommends IP allowlists and moving the management plane to a separate network segment.

• 1,592 of 2,823 VMmanager panels respond on port 443
• Only 15 and 1 interfaces answer on ports 8443 and 8080
• ISPsystem advises blocking inbound and outbound connections to the panel
• A title-based search query can confirm the firewall rule took effect