hi bro ... how u doing
first i am sorry coz i do not familiar with ISA server therefor i can not introduce a help to you in this way
but i can give you the replacement
you can use any Captive Portal to support the web login on wireless and wired networks.and there are many softwares and hardwares you can buy it
but i recommend (high recommend to use RADIUS server for providing secure authentication and automatic management of the encryption keys to the Wireless 802.11b, 802.11g and 802.11a networks supporting the 802.1x protocol in the EAP-TLS, EAP-TTLS and PEAP
i hope that can help you
to secure your wireless network
see you
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