root@eve-ng-pro:~# systemctl restart apache2
root@eve-ng-pro:~# systemctl status apache2

ssh was not working on the eveng-pro server

so I went to server screen directly and
ssh root@192.168.0.219

above ssh connection attempt gave error:
failed to restart ssh.service: unit ssh.service is masked

This means that ssh service is masked

systemctl status ssh

to fix it:

systemctl unmask ssh
systemctl enable ssh
systemctl restart ssh