F5 Webtop portal Access

I am trying configure portal access for webtop.... I tested webtop links works fine... But for that I have to allow those URLs to outside and make sure dns are configured....I don't want to go through all that... I want F5 to proxy connection from client and talks to VSERVERs... I think with portal I can achieve that....I am running into issue with following portal configuration:

 

 

why it works with webtop Links but not with portal Access. What I am missing.