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 <dholler@redhat.com>
Sent: 14 January 2020 16:23
To: Staniforth, Paul <P.Staniforth@leedsbeckett.ac.uk>
Cc: users <users@ovirt.org>; Miguel Duarte de Mora Barroso <mdbarroso@redhat.com>
Subject: Re: [ovirt-users] ovirt-provider-ovn external network provider
 

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Hello Paul,

On Mon, Jan 13, 2020 at 3:46 PM <p.staniforth@leedsbeckett.ac.uk> 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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