When promoting a server 2012 domain controller you see this error. Verification of prerequisites for Active Directory preparation failed. Unable to perform Exchange schema conflict check for contoso.local.
Exception: Access is denied.
When you launch the EMC you see either the message The WinRM Client Received An Http Server Error Status (500) or The attempt to connect to http://server.domainname.com/powershell using “kerberos” authentication failed:Connecting to remote server failed with the following message:The WinRm client cannot process the request.It cannot determine the content type pf tje HTTP response from the destination computer. The content type is absent or invalid