Windows 8.1 Pro Cannot Connect to Domain Controllers through Wi-Fi

I have a domain joined Surface 2 Pro running 8.1 Pro Update that is suddenly unable to connect to the domain controllers on the local network. The machine is fully patched. I'm guessing that it is some network level security issue because the wi-fi is working:
It has no trouble connecting to my Wi-Fi hotspot on my phone.
It has no trouble connecting to other Wi-Fi at coffee shops etc.
It is connecting to my home Wi-Fi and gets an address from DHCP on the domain controllers, but can't ping the DCs, access the DCs through remote desktop even using their IP address.
It can ping the router and ping systems on the internet using their IP address rather than hostname.
I can fully access internet systems if I point it at DNS on the router but still cannot access internal systems by name or IP address.
The Wi-Fi network shows as a public network rather than a domain.
It will work fine when it is docked and using the dock's ethernet adapter.
If I use VPN to loop back through my router then I am able to fully access local systems.
None of the other systems on the network are experiencing the same issue.
I have tried the following which didn't work:
Switched off the Windows Firewall on the Windows 8.1 system and a domain controller.
Network Troubleshooting - which told me that the network seems OK but the DNS servers are not responding.
Uninstalling the Wi-Fi device and restarting the system to re-install it.
Resetting TCP/IP.
I am not aware of any changes, but the system did install System Hardware Update 8/07/2014 (again!) but I can't recall if that was when the problem started or was just a coincidence.
Any suggestions?
Thanks,
Richard
Richard-F

Hi Richard,
Apologize for my slow understanding.
I thought as it could obtain IP address from the DC, it should have connections between them.
For the current situation, you may take a try to disable the firewall on the DC, then check the port that used by AD environment is all available,
Active Directory and Active Directory Domain Services Port Requirements, you could take use of this tool:
PortQryUI - User Interface for the PortQry Command Line Port Scanner
If all available and issue still insists, then issue here seems to be restricted with the wireless router. You may try to contact the router side and see if they could offer any further useful information regarding this situation.
Best regards
Michael Shao
TechNet Community Support

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