So I have this Fax number attached to a modem inside a Windows 2012 R2 DC.
I followed the steps on: https://technet.microsoft.com/en-us/library/jj134193.aspx to install and configure the Fax Service. Everything on the DC is working fine, I'm able to send and receive faxes just good using my domain admin account.
The problem is that I can't connect to the DC server over the network using the "Windows Fax and Scan" tool, whenever I try initiate the fax setup on a remote machine and connect to the fax server, the following error appears:
Not even the domain admin can connect, so I suspect that it has something to do with being a DC, but I could be wrong, any help is appreciated.