If you're having issues logging into League of Legends, this article will help you troubleshoot them. If you're getting an error that is related to your username or password, you should consider recovering your account instead. The issue could be caused by your computer rejecting the security certificates from our servers. Our client relies on a a particular browser depending on your client; Internet Explorer for Windows and Safari for Mac. These browsers must be configured regardless of your default browser, so be sure to make all suggested changes within each browser.