ISPmanager is written on server C (programming language) and rather stable, but sometimes panel could crash with no further restart (automatically). In this case we recommend you to restart it manually.
First of all connect to your server via SSH and in terminal type:
/usr/local/mgr5/sbin/mgrctl -m ispmgr exit
or you may restart Core Manager (ISPmanager core product) with the same result:
killall core
This panel restarting are usually a must when you are editing it’s configuration files located at:
/usr/local/mgr5/etc/ispmgr.conf