ISPmanager License requires to be regularly updated. If you have not done it in time, pay for the renewal and update the license (you do not have reinstall the software). Run the following commands on the server:
For ISPmanager 4:
1. Remove the license file:
rm -f /usr/local/ispmgr/etc/ispmgr.lic
2. Download a new license file server:
wget -O /usr/local/ispmgr/etc/ispmgr.lic http://lic.ispsystem.com/ispmgr.lic?ip=IP_ADDR_YOUR_SERVER
3. Restart ISPmanager:
killall ispmgr
For ISPmanager 5:
1. Remove the license file:
rm -f /usr/local/ispmgr/etc/ispmgr.lic
2. Download a new license file server:
wget -O /usr/local/ispmgr/etc/ispmgr.lic http://lic.ispsystem.com/ispmgr.lic
3. Restart ISPmanager:
killall -9 -r ispmgr