Hello,
This one has me baffled.  I recently added a new Mac mini to an otherwise all Windows & iOS LAN.  The mini is running 10.13.1 with all s/w updated.  The mini is connected to the LAN by cat6 ethernet cable with wifi disabled, and all aspects of networking are working well.
I've been unable to RDP into the mini from any platform that I've tried: Win7, Win10, iOS.  In each case, I get the "Remote Desktop can't connect..." message.  I've configured sharing on the mini to allow file sharing (which works fine), remote login (which works fine), and remote management (which doesn't work).  I've tried disabling the firewall, using the IP address instead of the mini name, restarting the mini, using wifi instead of ethernet, but no joy.  I can even RDP from the mini into the Win10 Pro machine that I'm using to type this post...
I'm using Teamviewer as a workaround but need RDP to work
because of its dual monitor support on the client machine (the mini is running headless).
Is there some setting deep in the bowels of OSX that might need to be tweaked?  Thoughts on other avenues I could try?

Please help.
Thanks,
I didn't find the right solution from the Internet.
References:https://forums.appleinsider.com/discussion/203027/cant-rdp-into-mac-mini-running-osx-10-13-1

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