Do you have configured software RAID on the RHEL machine? That is not supported by the VMware converter, and could be the problem.
Some have had succes with this by logging on as the local administrator - and then start converter with run as administrator.
Message was edited by: Ibrar Ashraf Have you checked out this KB? http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2059581