I'm no expert on this but it appears your URL isn't right from the testing I've done. It should be like
Thanks for your reply. I have used the formate like you have referenced. Below is the URL am loading in a iFrame. Works fine in Firefox, Chrome, Safari (No issues, its loading and showing doc, means valid url) . But in IE its popping up NT login dialog box (attached screen grab)
I believe the right link would be
(Yes, ticket instead of webticket)
BTW, not sure if you're aware but with webtickets you can redirect the user to the accesspoint instead of using direct links.