Thanks Dominik,
                              That pointed me in the correct direction, the 
ovn-controller.log was full of

stream_ssl|WARN|SSL_connect: unexpected SSL connection close

on the engine  ovn-sbctl  get-ssl produced no output

so after a hint from ovn-nbctl  get-ssl    I ran

ovn-sbctl set-ssl  /etc/pki/ovirt-engine/keys/ovn-sdb.key.nopass 
/etc/pki/ovirt-engine/certs/ovn-sdb.cer /etc/pki/ovirt-engine/ca.pem

and everything is working again 🙂

From the logs it appears that this happened around 3:30am last Friday but I 
can't think why?

Regards,
                  Paul S.
________________________________
From: Dominik Holler <[email protected]>
Sent: 14 January 2020 16:23
To: Staniforth, Paul <[email protected]>
Cc: users <[email protected]>; Miguel Duarte de Mora Barroso 
<[email protected]>
Subject: Re: [ovirt-users] ovirt-provider-ovn external network provider


Caution External Mail: Do not click any links or open any attachments unless 
you trust the sender and know that the content is safe.

Hello Paul,

On Mon, Jan 13, 2020 at 3:46 PM 
<[email protected]<mailto:[email protected]>> wrote:
Hello I was testing the ovirt-provider-ovn which was working but at some point  
seems to have stopped.


Sounds like the ovn-controller on the hosts has a problem.

Please ensure that the ovn-controller is running on all relevant hosts.
If it is running and not working, can you please share the ovn-controller.log 
with us?

Do you have any idea, what happened to the point in time it stopped working?
I heard similar stories already multiple times, but in the past, the users just 
restarted ovn-controller and all hosts and it was working again,
but it would be helpful to understand why it was stopped, to prevent this from 
happening again.



The logical networks are created and VMs have their ports created and attached 
on the hosts they run or migrate to but their are no geneve tunnels created and 
on the engine host "ovn-sbctl show" produces no output.
Any help appreciated.

Thanks,
               Paul S.
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