Hotspot and Windows 8 mobile phone

In a hotspot setup after the user logs in, the browser is redirected to a specific url (using code on alogin.html page).
This works fine on android and iphone mobiles.
I client of mine tested the system using a windows 8 mobile phone and though the login page pops up correctly it closes immediately after login without any redirection!
Does anybody experiencing the same problem?
I tested the system on a PC running windows 8 and everything works correctly.
Unfortunately I don’t own a windows 8 mobile phone and I can’t do any further tests so your help would be much appreciated!