It’s not the first time i got this error message and since i’ve solved it, i thought i’ll share this with the rest of the world.
a quote from an Microsoft Blog Post on Technet:
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.
Symptoms and Resolution
§ You may be unable to start or connect to virtual machines running on Windows Server 2008 or Microsoft Hyper-V Server 2008. This occurs when connecting using vmconnect. Connections made using remote desktop won’t be affected.
§ KB Article 967902 has been created that details the symptoms and resolution. This KB article provides a direct link to download the quickfix to resolve this error.
if you get one of these error messages:
apply this (KB967902) MS Hotfix to solve this issue.