KB article you are referring is asking you to do some activities on the host where your vCenter server is installed.
I think you are trying it on your client machine (windows 7) from where you are accessing vCenter server using vSphere Web Client.
KB article you are referring is asking you to do some activities on the host where your vCenter server is installed.
I think you are trying it on your client machine (windows 7) from where you are accessing vCenter server using vSphere Web Client.