# Adding compute nodes to Microsoft HPC Pack 2012 R2

I hit a stumbling block with adding compute nodes to new HPC cluster. If you see the following errors when deploying Microsoft HPC Pack 2012 R2 when joining compute nodes to the cluster:

HPC Node Manager Service unreachable


and

System.Runtime.Remoting.RemotingException: An error occurred while processing the request on the server: System.Runtime.Remoting.RemotingException: User identity is not authorized to connect to this endpoint


The solution is to add your installation credentials to the administrators group before install HPC pack on compute nodes. Edit : Seems to be a bug in 2012R2 Update 2. Get your compute nodes to use short NetBIOS name for your cluster instead of fully qualified domain name. Worked for me. https://technet.microsoft.com/en-us/library/cc514029.aspx