Seems something is preventing a socket connection to the web server, might be overloaded, guess it could be a DDoS? Could also be the web server is offline for a server-side technical problem. Is this your a dedicated server of yours?
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This is often times caused when you have another tab open to the site which is waiting on a .htaccess type password. For example, if you have a bunch of tabs open, close the browser then re-open but do not go to each tab and complete the login.
Very annoying and hard to diagnose. Even after I was aware of this issue it has got me a few times (I came across this thread after getting the error and once again not checking all my tabs to make sure I did not have any open tabs that were waiting on a password).