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  1. In case you're wondering why some things IPv6 don't work, here's a useful service: http://test-ipv6.com/ . Guess what: I found out that my Firefox was set to (default!) disable IPv6 DNS lookups - only direct-to-IP connections would work. I had no idea (and why on earth would that be the default - still)?? # # #

    Monday, 15-Aug-16 11:42:54 UTC from oracle.skilledtests.com
    1. After correcting that, and testing again, I get: "Your browser has real working IPv6 address - but is avoiding using it. We're concerned about this." Seems to be related to another setting, for "fast fallback" (Chrome/Chromium has this mechanism, too): test both connections, if IPv4 is faster, comntinue with that... # IPv6 # # # #

      Monday, 15-Aug-16 11:50:12 UTC from oracle.skilledtests.com
      1. In Firefox this setting is called network.http.fast-fallback-to-IPv4 (was set to default boolean true). I set it to FALSE but that doesn't seem to change the test result :( # # # #

        Monday, 15-Aug-16 11:57:21 UTC from oracle.skilledtests.com