Hi,
Had the same issue with a lab created from cloned esxi hosts; Everything seemed ok until i tried to enable HA and than I got errors like:
Reconfigure vSphere HA host Operation timed out.
Cannot install the vCenter agent service. Unknown installer error
Network partitioned
HA disabled
After some hours I discovered that the vmknic had the same mac addresses which caused all the trouble; I found these links usefull:
* http://www.vhersey.com/2012/08/cloned-esxi-duplicate-vmk0-mac-addresses/
* Change the MAC Address of VMKNIC on ESXi 5 - Bonus Bits Wiki
Hope this will save some time,
Traian