vSphere cannot connect after time on the host change

I am a relative noob when it comes to virtualization.  I did a lot of research for the response, but can't find it.  Maybe you guys can help.

Connected to the host (VMWare vSphere for ESXi 4.0) management console, I changed the time on the host because he was distant.  After that, the vSphere console has become very slow, and when I clicked on another tab it has expired.

I closed vSphere and tried to reconnect and now I have a message that says:

vSphere could not connect with the server vCenter Server "[host IP address] '.

Details: A connection failure has occurred (unable to connect to the remote server)

I went directly to the physical console machine and press F2 to enter the system setup.  I restarted the management agent.  I can ping the IP address.  I can not connect via puTTy, but I do not think that I never activated the SSH access.

Has anyone ever encountered this?  What should I do?  I can't restart the host right now because the production servers are running on the VMWare.  If I have to restart later, what is the correct procedure for this? (close the BONES of the VM, and then restart the host?)

I had this happen before. I was unable to restart the services or navigate from the console. I waited until hours off-peak and connected directly in the less critical guest OS and stop them. I had to stop several before I could get access again vcenter. Once I had access i vMotioned the rest of the guests to other hosts and restarted the ESXi host. It's a risk, because if you cannot close machines you have to powercycle. You seem to have access, so you can be able to stop them from the CLI on the host.

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