I'm using Total Security 2017 on Win10Pro x64 with all updates.
The problem is as follows:
Bitdefender blocks access to legitimate non-infected web pages:

All Web Protection modules are turned OFF:

Yes, the Notifications of Bitdefender shows that it was the Web Protection module that blocked access to the web page:

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Resolution: Fix the Web protection module so that when it is turned OFF, it is really turned OFF and does not block anything.