How ,without reboot of hosting system, do I restart the oVirt engine?

# I tried below but do not seem to effect the virtual machine
[root@thor iso]# systemctl restart ov
ovirt-ha-agent.service              ovirt-imageio.service               ovn-controller.service              ovs-delete-transient-ports.service
ovirt-ha-broker.service             ovirt-vmconsole-host-sshd.service   ovsdb-server.service                ovs-vswitchd.service
[root@thor iso]# 

# You cannot restart the VM " HostedEngine " as it responses:  

Error while executing action:

HostedEngine:


Reason is I had to do some work on a node.  Reboot it..  it is back up..  network is all fine..  Cockpit working fine...  and gluster fine..  But oVirt-Engine refuses to accept the node is up.
 

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