Cant connect to desktop through ts web access

Hi, 
Have a win2k8 enterprise server, with gateway and terminal services on the same server.

I use a domain cert, and have installed it on my vista client.

When I use RDP client it works fine to connect through ts gateway
remoteApps works fine too.
But from ts web access I cant connect to any remote desktops. It says i cant connect to the computer.

Any suggestion?

//Micke