Dear Ilian Iliev
I found log files in the locations you mentioned, and tried to find Errors or Exceptions as you asked, there was many log files and some of them big one, there was Errors and Exceptions too, I don't know which one would be useful for finding the problem. just to give more info, vcenter SQL 2008 is located in another windows 2008 VM. I'm going to install another vcenter server with local SQL express and try with it. I deleted and added again the vcenter server in VCO config page, it added successfully and I can see the same name in VCO client in inventory tab, but unfortunately vcenter has (unusable) localhost label and therefore can't be expanded to see other objects of vcenter like VMs, is there any configuration should I do in vcenter to enable a correct communication between VCO and vcenter?
Best Regards.
Sharifat