Hi ,
Since there is no connectivity to the Host via SSH, nor console. Reboot is the option left.
regarding the VM;s only option I am aware of is the logs.
1. Once rebooted if you have HA configured the VM's will be restarted on other hosts. so you could check the FDM logs for the VM;s that were registered.
2. On the affected host after reboot you could grep for the vmx that were registered.
# less /var/log/hostd.log | grep -i ".vmx" | less
--Avinash