Getting weird connectivity issues with RD Gateway. We have installed both RD Web and RD Gateway modules on the server. When you connect to the RD Web site, all works fine and we get the push notification. When we connect to the RD gateway, it says “Initiating remote connection” for 5 to 6 seconds and then denies the connection (we have the FailOpen setting set to 0). In the Application event logs, it says “There was an error communicating with the Duo authentication server”.
I’ve tested and all connectivity looks good (have followed the instructions in https://help.duo.com/s/article/1336?language=en_US). Also, the fact the RD Web application works okay shows the communication is there.
I have also rebuilt the server (in AWS) and reinstalled the applications and it’s the same - totally stumped as to what the issue is - can anyone help?