Resolution

First of all, you should request a Virtuozzo VPN certificate using the following web form:

http://www.parallels.com/en/support/virtuozzo/certificates

After the certificate is received the following steps should be done for configuring VZVPN:



(replace license.vzvpn with the actual filename) will install your certificate;



This command will set up network interface tap0 which will be used by
the support team to connect to your server. When the job is done, use



to close the tunnel. OpenVPN uses port 80 for communication, so, please,
make sure this port is open and configure proxy in /etc/vzvpn/vzvpn.conf if needed. You can also use port 443. It can be configured in the same configuration file.