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Internet problem with interface configured for ipv6 & ipv4

I was surprised to find that firefox v56.0 failed to access fedoraproject.org with "Secure Connection Failed" during TLS negotiation. I then tried to ping fedoraproject.org and noticed that ping was only receiving the ipv6 address.

Then I temporarily turned ipv6 processing off for my network interfaace - voila! I now can access fedoraproject.org to post this problem. Obviously, my temporary fix is not a solution to this problem.

I noticed the problem on October 3, many sites are affected.