This is one of the problems that you may face, When you start the VMs after you rename the host or join the domain you can’t start the VMs on taht host and face a problem that (Could not find a usable certificate)

For hyper-V with windows 2008 R2

VMName’ failed to initialize.
Could not initialize machine remoting system. Error: ‘Unspecified error’ (0×800070490).
Could not find a usable certificate. Error: ‘Unspecified error’ (0×800070490).

For Hyper-V with Windows 2008

VMName’ failed to initialize.
Could not initialize machine remoting system. Error: ‘Unspecified error’ (0×80004005).
Could not find a usable certificate. Error: ‘Unspecified error’ (0×80004005).

Hyper-V Certifcate Error

This is a well known problem for Hyper-V V1 use this update to solve it as per KB Article 967902 that details the symptoms and resolution.

For Hyper-V V2 just restart the host and everything will be fine.