To me it looks somerhing is not in right order with Web Pretection any mode.
I can reach from WLAN any LAN + DMZ address with disabled firewall rules any-websurfing-dmz or LAN
Any internal or dmz webpage with port 80 or 443 can be reached from all wireless networks.
Give it a try use your tablet from your wireless network and trying to reach one of your dmz or internal website port 80 or 443
with all firewall rules disabled and no exceptions in your browser.
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