Wifi problem

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Im sitting in a moyelrwith a wifi that uses a Captive Portal. That is wifi that is left open but when you try to get online it redirects you to a login page

My smartphones, LG Optimus V works fine as does my Uncles Windows 7 Toshiba Satellite laptop.

My tablet, Samsung Galaxy Tab 8.9 will not. Neither will my Acer Aspiron Ubuntu laptop. Both will just continuous show a loading page. They are connected to the network. They should rediterto the Captive portal but they just load. Any help would be much appreciated.

Bump, anyone have any ideas for help it would be much appreciated