In some reason iptables blocked the server from accessing DirecAdmin License Server for verification. This will cause DirectAdmin return "DirectAdmin License Expired".
- Turn off iptables or fine tune iptables rule so that DirectAdmin License Server are reachable by our server
- Resync DirectAdmin License with
/usr/local/directadmin/scripts/getLicense.sh 1597 <lic_id>
- Restart DirectAdmin