No login page on hotspot for some users (OSPF+EOIP)

Hi,

I have lots of EOIP tunnels coming to my central location from my APs. All users have RBSXT as client device set in station-bridge mode. My problem is that sometime some of my users can’t get login page. They have regular IP with correct gateway and DNS but no login page appears. They have valid value in hotspot hosts list but they can’t do anything. Just error page from IE. Any ideas where my problem can be?
Thx in advance

Anyone?