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Fedora 25 64 bit workstation - Some sites can be accessed, some cannot

If you run the page https://slack.com/help/test in your browser only the Web Socket connections fail. The issue occurs even when running Fedora 25 from live usb stick. I'm using DSL wired connection - I've tried everything (disabling firewalld, changing all values in the network settings, currently IPV6 is ignored) but couldn't find explanation as to why sometimes (even quite often) the Web Socket connections fail - https://slack.com/help/test Never had similar issue before with prev Fedora or Windows. Any help?