"No host data available" Reported in Hardware Status Tab
Just noticed a issue that nothing reported in 'Hardware Status' tab of ESXi hosts in vSphere Web Client. KB 2112847 gives a solution but not works for me. The feature can be used to monitor hardware failures. I figured out a way to workaround it. You just need to login by Administrator account and click 'Update' button under 'Monitor' - 'Hardware Status' for each ESXi host. You will get the status after few minutes.