Help Archos 70 can't connect with web logon

[joboy]

Using an Archos with latest firmware on 2.2, trying to connect to open wifi that requires web logon, but the browser did not forward to the logon page, tried different browsers but still the same, I can only connect to open network without logon, and those with keys, my Desire never complain on this, what the heck ? I found this tablet is extremely unstable crashing here and there, very few apps actually works, much worst than my phone.