I have a DAG with three members, exchange 2010 all with windows 2008R2 installed.
I have built a new windows 2012R2 server and installed the mailbox role. When i try to add the new windows 2012 mailbox server to the DAG it fails
Node ' ' failed to establish a communication session while joining the cluster. This was due to an authentication failure. Please verify that the nodes are running compatible versions of the cluster service software.
Security Handshake between local and remote endpoints '10.177.126.31:~7912~ -> 10.220.8.21:~3343~' did not complete in '40' seconds, node terminating the connection