This morning, Three (3) VMWare hosts (UISESX2, UISESX6, and UISESX8) had the following warning message:
Virtual machine creation may fail because agent is unable to retrieve VM creation options from the host (vmodl.fault.HostCommunication).
While investigating this error, UISESX2 disconnected from the vCenter server preventing us from managing the host and the 18 VM’s on this host. Research pointed to restarting the Management Agents from the console but this process hung at “running usbarbitrator restart” preventing this from being a viable option. Upon further investigating both of these issues, it was evident that the host would need to be rebooted before it could be reattached to the vCenter server. Once UISESX2 was rebooted, the host was reattached to vCenter and each of the VM’s were started.