Issue: Even when enabling UDP under transport setting in the remote desktop manager , My remote desktop gateway connections refused to use more than 1 UDP session at a time. Therefore reducing the connection speed and impacting user experience.
First Step: right click server name in remote desktop gateway manager and ensure UDP transport is enabled.
Note: Ensure you are forwarding UDP traffic from port 3391 (or what you set it to ) through your firewall from outside to inside.
The FIX:
The fix is actually very simple , for some reason even when you haven't set Group Policies relating to Remote desktop services and connections that assumes you want it off by default , which is annoying to say the least.
1. Open GPEDIT.MSC
2. Go to Computer Configuration -> Administrative Templates -> Windows Components, Remote Desktop Services -> Remote Desktop Session Host -> Connections
3. Select -> Select RDP Transport Protocols
4. Enable and select both UDP and TCP
for some reason when its not enabled it only gives you the one UDP session , it seems like a 2016 server glitch to me
oooooh happppy days..
