When trying to convert a physical server to a virtual one using the converter on the vCenter Infrastructure server I received the error during the conversion ‘Multiple connections to a server or shared resources by the same user, using more than one user name, are not allowed’
This was when using an AD account to authenticate to convert a Windows 2008 server that was acting as a Terminal Server
When I used the Local Admin account to authenticate I got a little further but then received the helpful error message ‘Unknown error generated from client’
I checked through the vCenter logging and just found service start errors
The only way that I could get around this was to install the Standalone Converter on the actual server to be converted and pushed the conversion onto our vCenter Infrastructure. One of the problems with this however was that it is not as clean so had to manually change the thin provisioning of hard disk storage and remove all the HP server related services and drivers.