Cannot access the Web http sites

Since yesterday, I have not been able to access any site that begins with http://, only Web sites that begin with https://. I do not download anything anything beforehand, it was working fine in the morning, but I came home in the afternoon and it did not work. No one else has used the computer. I can't go to these Web sites on firefox, safari or google chrome. I tried to unplug my router, clear the cache, history and cookies from my browser, resetting the computer, update the computer and the browser, use OpenDNS, but nothing works. I installed HTTPS Everywhere, that allows me to go on a site that wouldn't work before, but most of the websites that I use usually will not work.

I'm lost for what to do, so any help would be appreciated.

 / System Preferences / network / advanced / proxies / then deselect "proxy web http.

Tags: Notebooks

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