Let’s look at an example for the ISPmanager control panel. Check that the license server is available from your server – lic.ispsystem.com/ispmgr.lic?ip=your_IP_address and look at the configuration file – /usr/local/ispmgr/etc/ispmgr.conf.
This file must contain the LicIp 10.10.10.10 parameter, where 10.10.10.10.10 is the ip address to which the license is issued. If there is no such parameter or it says something else, please add/change it. After that remove ispmgr.lic and restart the killall ispmgr panel.
IMPORTANT: the fourth generation of our products will not work on various internal networks that do not have access to the Internet or are behind a NAT.