Can's connect PVM if the PVM joins a Domain.

[ShawnZTX]

I have a problem with PVM, I use Apache Guacamole to connect PVM from outside of our network, I can connect Windows VM under the workgroup at no problem, but if that PVM joins a domain, I can't connect that PVM anymore. The guacamole connection didn't change anything; only the PVM joins a domain, the connection is lost, and if I unjoined the domain, the connection is restored. Any suggestion will be helpful. Thanks