I have the same issue. github.com and reddit.com are also not working with Opera on GNU/Linux.
Posts made by equeim
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RE: I can not go on (https://forums.opera.com/help, http://www.opera.com/ru/help/account) in Opera 40Opera for Linux
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Opera can't load certain sitesOpera for Linux
E.g. github.com, auth.opera.com, reddit.com. It says "This site can’t be reached". All other browsers and Opera on Windows works fine. I use Arch Linux, Opera installed from official repositories (version 40.0.2308.54).