I have configured RDS on 2012 R2 systems, 2 x Collection host servers and 1 server for Gateway, Broker, Web Access.
Everything is working fine internally. Externally can connect to RDweb OK but when click on App it will just sit and get stuck starting. RDP session has to be ended in Task Manager.
When connected via VPN works no issues.
I am also using the gateway with RDP to connect to management servers remotely with no issues as well, so I know the gateway works. Got me stumped