Webauth redirect issue

Hello,
My guest access has not been redirected to guest portal on ISE.
I setup a Guest wlan using foreign-anchor scheme and web authenticate on ISE. DHCP is managed by Anchot WLC and I got ip address without any problem. I can ping ISE and Default gateway without problem from guest laptop.
Proxy and dns is on the same server and this server is the default gateway for guest network. My DNS Server stopped and all webauth stopped.
What is the part of DNS In this scenario ? Does URL redirect stops if DNS goes down ?
Please help.
Sent from Cisco Technical Support iPhone App

Thanks for your reply.
I type directly google.com ip addres into web browser and it seems to work, however it redirect me to internal authentication portal. I think i did a change on my foreign controler and change to internal web auth (anchor still external web auth) So i want to ask another question, does foreign controller take part on this process even mobility anchor setting placed ?
Sent from Cisco Technical Support iPhone App

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