I have about 200 users running mostly remoteApp from many different locations. 95% of them work fine. I do have RDGateway but it is configured to bypass the RDGateway in the setup if it can connect to the broker. Things have been working fine for the past year or so. Recently on the last set up updates for windows 10 machines, they receive the error "Your computer can't connect to the remote desktop gateway server. Contact your network administrator for assistance" as soon as they try and launch and RemoteApp application.
The fix is this.
https://appuals.com/fix-your-computer-cant-connect-to-the-remote-desktop-gateway-server/
It forces it to disable UDP and use HTTP instead. As far as I can tell nothing has changed on the network and UDP is still open and clients are able to connect to it.
Has anyone ran into this?