Simple question: Have you tried to restart your services?
1.) VMware VirtualCenter Server
2.) VMware VirtualCenter Management Webservices
Visit the URL : https://virtualcenterserver to check if it is running.
Basically, I have PC installed with vmware 7. In which I installed Windows R2 2008 Server. I installed vCenter Server 4.1 in R2 Server. Added the location and added two EXS and EXSi servers. It is working perfect. Since this is all on vmware so when I had to shutdown my PC I stopped the vmware machine of Windows R2 server. Obviously vCenter is also closed at that time. On the second day I tried to open my vCenter from vSphare client then it is showing me the same error which is attached in my first email.
Kindly add comments/suggestions