To determine how RAD connections are established between the controller and the nodes, you set the uri-template property. The property's default value is ssh://.
If all the EVS nodes are on the same physical system, then using local connection is sufficient. You would set the property as follows:
$ evsadm set-controlprop -p uri-template=unix://
In a multinode environment, you should use SSH to connect. Further, because evsuser has been provided specifically for EVS configuration, then specify that user for RAD connections.
$ evsadm set-controlprop -p uri-template=ssh://evsuser