Thanks for any help given !
I have configured my server 2008 r2 box with AD and Dns etc to enable rd web access and remote app running.
My users can login to the RD Web access screen through IE using the credentials I gave them in AD but when the select the app and connect they get 'The remote computer could not be found. please contact your helpdesk about this error.'
what I find really strange is I have 3 other box's the exact same that all offer different apps to users but this one will not play ball. I also have ports 88, 135, 139, 389, 445, 464 and 593 disabled to give a clearer picture
Thanks again