Vista - problem autentication a wireless network trough web interface http

hello I have a problem with authentication wifi through web interface https:
use a line where wireless internet access, I must enter username and password
on the page https authentication technology captive portal. xp with the wifi
network connects and I see the page with authentication technology captive
portal, with views instead detects the r3ete wifi you connect without
problems but the page authentication technology captive portal does not
appear that gives me prevents' access to the Internet can help solve this
problem thanks in advance