As we do receive customer mentioning that the Directadmin Control panel
can't restart even restart inside the SSH.
To simply resolve this issue.
editing /etc/systemd/system/directadmin.service
added to [Service]
Restart=on-failure
And restart your Directadmin again via SSH with below command.
service directadmin restart
And it should resolve your issue, if still can't restart. Contact support
directly for Free help.