If you run into an issue with the "Overview" page under the Performance Tab in vCenter, then follow these steps to resolve.

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Log into the vCenter server
Browse to the following locations:
C:Program Files (x86)VMwareInfrastructuretomcatwebappsstatsreportWEB-INF folder
Open the <strong>web.xml</strong> file in notepad
Once the file is open, and search (CTRL+F) for <strong>vc.webservice.timeout</strong>
Note: The entry should be near the top of the file, about 15 lines down from the top.

Change the value on the following line from 1 to 5


This is the only change needed

Save the file
Restart the VMware VitualCenter Management Webservices
Login to the vCenter and highlight and ESX host, click on the Performance tab and the information should display correctly.

If not, then be sure on your vCenter server to add in the followin entries to your Trusted Sites and try again:
<strong>https://127.0.0.1</strong>
<strong>https://vcenter FQDN</strong>