The RPC server is unavailable on the specified computer

Hi,

I've configured two Adfs servers and joined them in farm.

Primary - adfs1

secondary - adfs2

I've added Network Load balancing features in both the servers.

In primary server I've created a cluster and successfully joined the primary server in the NLB.

But, when I tried to add second server, status showing access denied and prompting for credentials, when I give domain admin credentials, the status showingThe RPC server is unavailable on the specified computer.

Both the servers are running in Hyper-v and having single ethernet only. Any suggestions???

Thanks.