Windows 2008 RemoteApp Problem

I don't know where to post this so please pardon me for posting it here.

I have recently deployed Windows 2008 R2 for my pilot project.

I publish Remote App Internet Explorer. I made a installation package.

Install it on windows XP machine fire it up and bing it worked. MY TERMINAL

SERVER WAS connected on the LAN. I move the TS to DMZ and did the same thing

It wouldn't find the server. I then type MSTSC and fire up a RD and it can

connect then LOG ON then I can fire up internet explorer. WHY REMOTEAPP don't

work no clue.

Please help

Thanks