Board Thread:Questions and Answers/@comment-26887380-20150813190608/@comment-26379398-20150813202402

That's a connection error. If you are logging in with a VPN is very common for it to happen since a VPN isn't the most stable of connections. I would recommend you to use either Hello! chrome extension (which is a proxy, slightly more stable) or cookies.

Here you can find a handy guide on the issue which can help you more.