Either upgrade your browser, or enable localStorage. Your browser either does not support localStorage, or it is disabled for. While, I test my browser, got an error as shown below: Storage – failed. The page would run few tests to check for the availability of certain necessary features in the browser. When I was stumbling upon to implement Single Sign-On in one of my web-project, came across a solution implemented by StackOverflow using HTML5 LocalStorage. While following it up with the technical details, came across a troubleshooting page for auto-login.