With the host in a "not responding" state, and what you mentioned, I assume that it is an issue with the Management Agents. What you may do (which shouldn't cause issues with the VMs running on that host) is to restart its Management Agents from either the console (DCUI), or through an SSH session. For details see http://kb.vmware.com/kb/1003490
André
Hi ,
Appears that the HOSTD internal process on the host is exhausted and and the host is unmanaged .
SSH to the host and run the command and wait for it to finish .
# services.sh restart
Try and connect to the host after that .
Please share the results.
Thanks
as other ppl have recommended, try restarting your management agents:
ssh into the effected Esxi host:
/etc/init.d/hostd restart
/etc/init.d/vpxa restart
or
services.sh restart command should do it...
Services.sh restart command will restart all the management and other imp daemons on the hypervisor there will be no impact on the running virtual machines.
Did you check the Port is opened between vCenter and Host ?