I am creating a cluster of Red Hat Enterprise Linux 7.4 Virtual Machines with ArcGIS Server 10.5 installed and licensed with EDN license. The Sever Site adds 3 VMs but when I try to add a 4th one it displays an error stating
"The license of ArcGIS Sever at 'vm4arcgisserver' does not match with the license of the site running at 'https://:vm1arcgisserver.esri.com:6443/arcgis/admin'. All the machines in the site are required to have the same license."
I am curious whether it is a licensing issue which is limiting me to add more than 3 VMs or there are some configurations needed to be modified?