Same problem, same solution. But for Windows 7. Thanks Waratah, and all. For my case, Internet Explorer (not default browser) could not browse webpages, and was solved by unchecking the "Automatically detect settings" box. When Internet Explorer could browse webpages, then Evernote was able to Sync and login. Now it works. - Internet Explorer -> Internet Options -> Connection -> LAN Settings -> Then uncheck the box: "Automatically detect settings"