Virtuozzo updates are installed. When I try to reach the Plesk Control Panel, I get a “Service Unavailable” error message. The Windows firewall with the default Plesk setting is running inside the VE.
Since these updates impact the Plesk-VZPP integration, port 8880 is required for communication between VZPP and Plesk. Now, when you go to http://VE_IP:8443
, you are redirected to VZPP, which tries to reach Plesk by means of the 8880 port. When the Windows firewall (which is managed through Plesk) has the default Plesk settings, it blocks this port and won’t allow VZPP to communicate with Plesk. It will return a “Service Unavailable” error message.
Open the 8880 port inside the VE that has Plesk running inside of it.