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RDP fails over VPN

RDP fails over VPN

(OP)
Recently (last week) we started having issues with the VPN/RDP connection for a couple of users. One user has no issue. Here's the setup:
- remote user logs in to the VPN server. Connection established
- User can ping IP address of remote server through the VPN tunnel
- User launches [Windows 10 Pro x64] RDP client with server IP address in the destination
- System times out with error "An internal error occurred" (big help that is!)

If we create a firewall rule to allow RDP connection specifically from the RDP client, over the WAN, to the public IP of the firewall, RDP works fine! If we VPN into the firewall and try to run RDS it fails (with the error listed).

We can RDP INSIDE the LAN just fine so this is DEFINITELY a Sonicwall firewall issue...we just can't understand where it came from! Firmware on the firewall is SonicOS Enhanced 5.9.1.7-2o.

The model is: NSA-250M
There are 17 VPN licenses (2 are being used).

Any thoughts what the issue could be? We can't find anything in the logs where the RDP connection is getting denied, over the VPN, but it sure works if we go directly to the WAN IP! Except we need the VPN so we need to get that working.

Any help is greatly appreciated!

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