To disable google https mode, we can follow this method :
“To utilize the no SSL option for your network, configure the DNS entry for http://www.google.com to be a CNAME for nosslsearch.google.com.”
I’m not sure how i can do that with zeroshell. Declaring a dns zone seems a bit too much.
If the Captive Portal (transparent proxy) can redirect http://www.google.com to nosslsearch.google.com, maybe you can use that instead of pretending to be google.com in Zeroshell DNS.
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