While troubleshooting a fresh installation of (after a failed one) that caused all the hosts but the one running the hosted-engine to become in “Unassigned” state I noticed that the ovirt-engine complains about not being able to contact the VDSM. I noticed that VDSM has stopped listening on IPv4. I didn’t disable any IPv6 as it states not to disable it on hosts that are capable running the hosted-engine and it seems that the reason behind it is that the hosted-engine talks to the host it runs on through “localhost”, this also explains why the host which the hosted-engine runs on is “OK”. Below is from a host that does not run the hosted-engine: # ss -atn | grep 543 LISTEN 0 5 *:54322 *:* ESTAB 0 0 127.0.0.1:54792 127.0.0.1:54321 ESTAB 0 0 127.0.0.1:54798 127.0.0.1:54321 LISTEN 0 5 [::]:54321 [::]:* ESTAB 0 0 [::ffff:127.0.0.1]:54321 [::ffff:127.0.0.1]:54798 ESTAB 0 0 [::ffff:127.0.0.1]:54321 [::ffff:127.0.0.1]:54792 ESTAB 0 0 [::1]:54321 [::1]:50238 ESTAB 0 0 [::1]:50238 [::1]:54321 Below is from a host that runs the hosted-engine at the moment: # ss -atn | grep 543 LISTEN 0 5 *:54322 *:* LISTEN 0 5 [::]:54321 [::]:* ESTAB 0 0 [::1]:51230 [::1]:54321 ESTAB 0 0 [::1]:54321 [::1]:51242 ESTAB 0 0 [::ffff:10.46.20.23]:54321 [::ffff:10.46.20.20]:45706 ESTAB 0 0 [::ffff:10.46.20.23]:54321 [::ffff:10.46.20.20]:45746 ESTAB 0 0 [::1]:51240 [::1]:54321 ESTAB 0 0 [::1]:54321 [::1]:51230 ESTAB 0 0 [::1]:51242 [::1]:54321 ESTAB 0 0 [::1]:54321 [::1]:51240 The hosted-engine IP is 10.46.20.20 and the host is 10.46.20.23. /etc/hosts on all hosts: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 Perhaps this is relevant but all hosts are enrolled into IDM (FreeIPA) and as an outcome they all have a DNS record and a PTR record as well as the ovirt-engine VM. # cat /etc/vdsm/vdsm.conf [vars] ssl = true ssl_ciphers = HIGH:!aNULL ssl_excludes = OP_NO_TLSv1,OP_NO_TLSv1_1 [addresses] management_port = 54321 I have tried adding “management_ip = 0.0.0.0” but then it only binds to IPv4 and yet, the host still shows as Unassigned, sometimes it switches to “NonResponsive” and trying to “Reinstall” the host fails, the ovirt-engine complains it can't contact/reach the VDSM, while using netcat from the ovirt-engine it works. I have KSM and Memory Ballooning enabled on the Cluster as well. oVirt 4.3.10 installed on CentOS 7.8.2003 The self-hosted Engine runs on an external GlusterFS, before reinstalling everything (fresh start of OS, etc..) I tried iSCSI as well.