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Captive Portal https problem For Guest Network

Hi;
 
Who use the captive portal have had problems accessing HTTPS sites.
 
I couldn't find the true answer in SOPHOS community.
 
I will try to explain the problem in detail below;
 
I created 2 rules from the LAN TO WAN, the top rule only allows DNS for Captive Portal. After this rule, I create second LAN TO WAN rule for Match known users internet access.
 
If user wants to visit the http site, SOPHOS redirect to user http://<sophos XG 310>:8090/httpclient.html?u=https://www.google.com/  URL and shows captive portal login page. It is OK no problem.
 
BUT —> If user wants to visit the HTTPS site certificate warning screen comes and Captive Portal not display. You can't pass this warning, especially if google chrome is using it. 
 
it's impossible for us to install the sophos serifica for the guest user.
 
Is there a way to redirect https access to Captive Portal URL(http://<sophos XG 310>:8090/httpclient.html?u=https://www.google.com/ ), as in http access?
 
I want to redirect all non authenticated connections to Captive portal, httpi https, etc.


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