Re : Database encryption on different server

Thanks Ganes for your reply! 
It worked very well! 
But I have an other small question. I build the VM with no internet connection.  I did this to dont have problems withe the license. Now I want to rebuild my secondary PMP Server to test the High availability after the updates. However do I need a Domainserver in this test network and I dont want to create an new one. 
So is it possible the restore the secundary Server otherwise or connect both servers without an domainconnection?