issue access RDWeb from Internet

I have Windows Server 2012 RDS setup with RD Gateway, same VeriSign certificate configured for all RD Connection Broker, RD Web Access, and RD Gateway.

From internal, access to RDweb works fine, from internet, I can log on and see the published applications, but when I double click any published application, and type credential, it try to connect to my session broker with internal FQDN and fails.\

What I missed? How to correct it?

Thanks for you help.