I have a 2012 R2 server that I setup RD Gateway services and setup RemoteApp. Internally it all works fine. The problem is the company was a branch of another company then bought out. So the internal domain name is a .com that matches a different existing company. So when I go to the .../rdweb and log in all is fine, then I select to open calculator and give it the user name, so far so good. It then opens an error saying it can not validate the certificate because the RD Gateway is the servername.old-company.com. I think all I need to do is get the RD Gateway address reported to the client corrected to the correct FQDN and I'm good. I can not seem to find a way to do that. I tried the Set-rdpublishedname script from http://gallery.technet.microsoft.com/Change-published-FQDN-for-2a029b80 but it does not change the RD Gateway address. Unless I'm using it wrong.
All suggestions welcome. Thanks so much.