VMWare ESXi Host SSL key changed?

I have 2 ESXi 4.0.0 servers that have been running for a couple years. Saturday morning. I got a call from the help desk saying that several of the guests were down. I opened up my vsphere client and connected to my vcenter server. It told me that server 5 was disconnected and all of the guests on server 4 were not responding.

 

I tried shutting down the guests, but I was unable to do so. I was able to ssh into the servers and reboot them both from there. They both came back up and all the vm's came back up, but I am still unable to connect server 5 to the vcenter server. When I try, it tells me the ssl key has changed. It then startes trying to connect. It gets to 9%, then I get disconnected for about 3 - 5 minutes. In the event viewer, I get the message "The VMware VirtualCenter Server service terminated unexpectedly.". It is then automatically restarted.

 

I am able to connect to server 5 directly with the VSphere client and everything seems fine. The only thing I have noticed is that when I am looking at the client and it is connected directly to a host instead of to the VCenter server , all of the guests seem to randomly blink on the list on the left side of the window.
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bcdudleyAsked:
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bcdudleyConnect With a Mentor Author Commented:
I was able to resolve this. One of my VM's had over 30 snapshots and was preventing the host from being a member of the farm. I had to clone the guest and delete the original to resolve the issue.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Have the SSL certificates been changed on vCenter or the Hosts?

Do you have a Self-Signed SSL certificate issued by a Local Certificate Server, if the certificate is changed on vCenter, ALL the hosts will disconnect, and you will need to reconnect and use the root username password to re-add to vCenter.
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bcdudleyAuthor Commented:
The certificates have not changed. They were auto generated when the VMWare servers were built I am assuming. I have never created anything of the sort. I am the only person that accesses the VMWare hosts and I have not made any recent changes in months with the exception of adding/removing VM guests and adding a new San Lun last week,
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bcdudleyAuthor Commented:
This was the correct answer.
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