VCSA Setup frozen on validating

Hi everyone, 


I am trying to upgrade VSPHERE 6.0 VCENTER SERVER APPLIANCE: UPGRADING FROM 5.X (in my case5.1 U3) as in the guideline below: http://anthonyspiteri.net/vsphere-6-0-vcenter-server-appliance-upgrading-from-5-x/ 


Unfortunately, the upgrade is frozen at 3. Set up virtual machine "Validating.This might take several minutes". After 12-24h of leaving it at Validating, the process is not moving forward:


!http://picz.ro/img/f7f2f0.jpg|alt=|src=http://picz.ro/img/f7f2f0.jpg!


Can someone give me a suggestion/solution?


I'm trying anything and everything.


Thanks.


Radu