Following article may help in your scenario... Windows user account gets locked out when VirtualCenter Server service is running: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1007293

My domain admin account keeps locking after a recent password change. I used the account lockout tool EventCombMT to track it down to a particular server. I have deleted my profile from that server and checked services to make sure that my account is not tied to any services. However, when I start the VMware vCenter Server the account locks shortly after. What else can I look at to track down this issue? TIATIA Troy

What is your admin domain account, built administrator or that you have added? Has you tried to disable this account and enabled it again? I have similar problem with expiration of password and disable-> enable procedure has cured my admin. Regards Milos

IF the account becomes locked out only when starting vCenter, then, check the vCenter configurations?Don

Following article may help in your scenario... Windows user account gets locked out when VirtualCenter Server service is running: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1007293