I asked the same question on DNN Administration and Configuration forum: http://www.dnnsoftware.com/Resources/Forums/forumid/108/postid/473832/scope/posts.aspx
I found a solution for making the website working for public users but the problem remains for the back end administration tasks like: add, update, delete modules or when you login / any kind of action on the website is going to forward you to main port.
Know I have another problem which is when the user try to use contact us form or search its redirecting them to the main port which is in my case port 82.
Live Example: go to http://trustsecurity.ae/Default.aspx?tabid=110&language=en-US
and try to fill the contact us form or try to use search on the website.
result will be the same (Page not found) or (Oops! Google Chrome could not connect to trustsecurity.ae:82)
anyone have an idea what to do??