Some additional information, but no solution yet: I noticed that SELinux (the host has it in enforced mode) had prevented qemu-kvm as well as ovs-appctl from accessing some files and directories. Unfortunately even disabling SELinux (setenforce 0) did not resolve the core issue :-/ Poltsi

On 28/08/2022 11.12, Colin Coe wrote: The host (a single one) has a single network device. It is a Dell Latitude laptop, so nothing fancy. I've run some tcpdumps, and it looks like at least the ICMP and TCP traffic from another machine on the same subnet does get to the host (as confirmed by running tcpdump on the host), but then it disappears. It never gets to the engine VM (running also tcpdump). Interesting detail is that ARP does seem to get to the engine VM as I can see the expected "request who-has <engine VM DNS> tell <another machine on subnet" and "Reply <engine VM DNS> is-at <MAC>" on the engine VM-side. FWIW the packages should be the latest from the centos-release-ovirt45, including ovirt-hosted-engine-setup-2.6.5-1.el8.noarch. Poltsi