I just added a Hyper-V 2012 R2 server to the 2012 R2 main server.  Using "Right-click ThisPC>Properties> change from workgroup to Domain: mysite.com I added to the main server domain.  On the main server I added the computer to DNS with the Hyper-V IPv4 address.  The problem is in Server Manager>All Servers it showed there but the is an error: "Kerberos security error".  How do I correct for this?

Hi

 Did you mean add server to server manager?You need to add server to server manager with "manage as" command,

https://technet.microsoft.com/en-us/library/hh831453.aspx?f=255&MSPPError=-2147217396

Also check this article for kerberos security error,

http://social.technet.microsoft.com/wiki/contents/articles/13444.windows-server-2012-server-manager-troubleshooting-guide-part-ii-troubleshoot-manageability-status-errors-in-server-manager.aspx