CedricAnto
VMware Employee
VMware Employee

If its vCSA 5.5, it is likely to be this,

VMware KB: vCenter Server Appliance 5.5 root account locked out after password expiration

For other versions there are few possibilities I can think of

Do you have any password management/compliance utility , these tools have a tendency to reset password regularly

Or

Have you configured password aging

Interesting thing to note is that on a reboot the password is recovered, strange...

Cedric http://in.linkedin.com/in/cedricrajendran/ http://virtualknightz.com/
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