[ovirt-users] Can't bring upgraded to 4.3 host back to cluster

Hello, May I ask you for and advise? I'm running a small oVirt cluster and couple of months ago I decided to do an upgrade from oVirt 4.2.8 to 4.3 and having an issues since that time. I can only guess what I did wrong - probably one of the problems that I haven't switched the cluster from iptables to firewalld. But this is just my guess. The problem is that I have upgraded the engine and one host, and then I done an upgrade of second host I can't bring it to active state. Looks like VDSM can't detect the network and fails to start. I even tried to reinstall the hosts from UI (I have seen that the packages being installed) but again, VDSM doesn't startup at the end and reinstallation fails. Looking at hosts process list I see script *wait_for_ipv4s* hanging forever. vdsm 8603 1 6 16:26 ? 00:00:00 /usr/bin/python /usr/share/ovirt-hosted-engine-ha/ovirt-ha-agent *root 8630 1 0 16:26 ? 00:00:00 /bin/sh /usr/libexec/vdsm/vdsmd_init_common.sh --pre-startroot 8645 8630 6 16:26 ? 00:00:00 /usr/bin/python2 /usr/libexec/vdsm/wait_for_ipv4s* root 8688 1 30 16:27 ? 00:00:00 /usr/bin/python2 /usr/share/vdsm/supervdsmd --sockfile /var/run/vdsm/svdsm.sock vdsm 8715 1 0 16:27 ? 00:00:00 /usr/bin/python /usr/share/ovirt-hosted-engine-ha/ovirt-ha-broker The all hosts in cluster are reachable from each other ... That could be the issue? Thank you in advance! -- Regards, Artem