RemoteApp and Remote Desktop services issue with gateway
I have installed Remote Desktop Services on Windows Terminal Server 2016 TP5 servers.
I'm using a gateway, in order to connect from outside over HTTPS.
RemoteApp and Remote Desktop are working really good from Windows Computers Clients with the Remote Desktop Application (from the Windows Store) or with the default mstsc client.
When I use the same application for a Windows Phone 10 device, or with the Android or iOS application it doesn't work, even if I use the same wifi network as my laptop.
I can add the remote ressources, but I cannot connect to them with the same configuration as my laptop (correct credential, hostname, gateway address...). Same thing for Desktop connections.
The error seems to be the gateway, but I don't understand why it works with my laptop and not with any mobile phone.
On the Windows Phone, I get the following error message : "we couldn't connect to the gateway because of an error. If it keeps happening, ask your admin or tech support for help"