May I know if you are running the JTAG Server in root/admin right? I would recommend that you stop the JTAG Server and relaunch your Quartus in root/admin right before enabling remote access.
The other thing is that could you try to check if you are able to communicate between the 2 PC?
when you said jtag server, do you mean jtag server running on my Windows 10, to which the dev board is attached by JTAG?
OK I'll try to launch jtag with admin authority and see how it will go.