Internally there's no issue connecting. Externally, we can access RDWeb, but when launching the published RDP collection comes back with error after entering credentials - You're computer can't connect to the Remote Desktop Gateway Server. Please contact your network administrator. We have an existing RDS environment that is currently working, we are setting up a test environment on a new hardware.
Server 2012 R2.
Fresh install, Single Server Deployment Setup for Proof of Concept. (GW, Host, Licensing etc. in one server)
Public Cert installed.
Different Public IP, Port Forwarding is correct
We pretty much copied the settings on the working RDS but for some reason this test environment is not working.