First obvious thing to check is to make sure that you do not have any other NeoLoad instances started on another machine. It might be the case when you move your license from one computer to another.
Another possible root cause is when you have VMWare interfaces on your controller machines. Deactivate those VMWare network interfaces and make sure that they do not appear anymore on the output of "ipconfig /all".
When it's done, start again NeoLoad.
