I have a server 2012 set up as a stand-alone server outside of our domain as a hyperv server. All of the member virtual servers are a part of a domain. This has not appeared to be an issue. I turned off firewall on hyperv server remotely and lost my ability to connect remotely. It appears that I will have to re-enable from console.
My question is... what are the advantages and disadvantages of having your hyperv server setup outside of domain. Is this a good idea/ bad idea?