VMware: What if ESXi Hosts Becoming Disconnected from vCenter
Cause: Recently we have been experiencing problems with ESXi 4.1 hosts becoming disconnected from vCenter. Troubleshooting Steps: 1. Right clicking on the host and selecting Connect does not normally fix the problem. Also logging in directly to the host with the vSphere Client usually does not work, or if it does it disconnects quickly after connecting. 2. All of the virtual machines running on the host continue to run; however without the host being connected to vCenter or being able to connected directly with the vSphere Client you are unable to manage the virtual machines. Also, connecting to the host with PowerCLI does not work, if it does connect it drops the connection soon afterwards.