For those of you who’ve enabled the Hyper-V role in WS08. It has been determined that a certificate error can occur resulting in the inability to start or connect to virtual machines running on Windows Server 2008 or Microsoft Hyper-V Server 2008.  The Hyper-V virtualization host and the existing virtual machines will continue to operate without disruption.  A hotfix designed to prevent/resolve this error has been created and is available for download starting today.  The following is a brief description of the issue as well as a link to the KB Article that provides the resolution.  Even if you are not currently experiencing this issue, we recommend you download and install this update.