I have more than one ticket about what turns out to be a long standing bug with libvirt in BSD loosing network connectivity..and by extension it looses connection with the webui so the only you can do is dirty down the vm and then restart it. SCALE in alpha works MUUUUUCH better than BSD(CORE) does at v12+. Windows would run for maybe a minute in TNC before loosing connection..my linux vm's it's random..but it happens..always does. Sclae..at Alpha has been much much better and if this continues I tntend to use SCALE as my hypervisor at hte very minimal. Doing some more self-research libvirt in FBSD has been problematic going back years. I know IX has been trying to squish this along with the FBSD community..but the issue remains. Once BSD can get that issue fixed then i'll be able to realize my dream of an all BSD stack from firewall to storage to virtualization..:)