RDP connection issue

We had a VM in Hyper V server that was running fine and in domain.Due to some issue we removed the list from Hyper-V manager and added it back using Import Virtual Machine. Now when I try to do an Remote desktop connection(local admin account) from my laptop I am getting following certificate errors Sever name on certificate is incorrect The certificate is not from a trusted certifying authority When I login using a domain account I am getting An authentication error has occured (Code:0x80004005). What might be the reason ?