I was doing some testing with vCenter Server 5.1.0b this Wednesday and Thursday and just noticed it was released today. Those who were experiencing time-out issues with the web client or were unable to login to the web client using a non-standard UPN as an AD user will want to check this release out.
Full release notes can be found here. I did the upgrade using the upgrade repository iso: VMware-vCenter-Server-Appliance-22.214.171.12400-947940-updaterepo.iso. Very useful if you do not have direct access to the internet from your vCenter Server Appliance. Steps are straight forward:
--> Please see the rest and the steps on the blog : http://www.yellow-bricks.com/2012/12/21/vcenter-server-5-1-0b-released