I ended up cheating in the end. I copied vdsmcert.pem and vdsmkey.pem from the host that is still working to the others and did a chown on the files. All the hosts are back online without downtime. I must have rebuilt that server a couple of years after the other ones. Thanks Gary Lloyd IT Infrastructure Manager Information and Digital Services 01782 733063 Innovation Centre 2 | Keele University | ST5 5NH   -----Original Message----- From: Strahil Nikolov <hunter86_bg(a)yahoo.com&gt; Sent: 06 January 2021 12:11 To: Gary Lloyd <g.lloyd(a)keele.ac.uk&gt; Cc: users(a)ovirt.org Subject: Re: [ovirt-users] Hosts are non responsive Ovirt 3.6 Have you tried to put a host into maintenance, remove and then readd it ? You can access all Red Hat solutions with their free developer subscription. Best Regards, Strahil Nikolov В сряда, 6 януари 2021 г., 13:17:42 Гринуич+2, Gary Lloyd <g.lloyd(a)keele.ac.uk&gt; написа:    Hi please could someone point me in the right direction to renew ssl certificates for vdsm to communicate with ovirt 3.6 ? I’m aware that this version hasn’t been supported for some time, this is a legacy environment which we are working towards decommissioning.   There seems to be a fix article for RHEV but we don’t have a subscription to view this information: How to update expired RHEV certificates when all RHEV hosts got 'Non-responsive' - Red Hat Customer Portal   These are what the vdsm hosts are showing: Reactor thread::ERROR::2021-01-06 11:04:59,505::m2cutils::337::ProtocolDetector.SSLHandshakeDispatcher::(handle_read) Error during handshake: sslv3 alert certificate expired   I have rerun engine-setup but this only seems to have fixed one of the vdsm hosts and the others are non responsive. The others are in different clusters and we have some important services still running on these.   Thanks               Gary Lloyd    IT Infrastructure Manager    Information and Digital Services    01782 733063    Innovation Centre 2 | Keele University | ST5 5NH        _______________________________________________ Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/HT6Z3WHPFTB...