How Do I Fix 401 Unauthorized Error? 【2026】

The most common cause of a 401 error is simply an incorrect login. Because this error is distinct from a 403 Forbidden error—which means you are logged in but don't have permission—a 401 specifically signals that the system does not know who you are. The first step in troubleshooting should always be a thorough check of your credentials. Ensure that your username and password are correct and that you haven't recently changed them on another device, leading to an automated login failure on your current one.

Understanding and fixing a 401 Unauthorized error is a fundamental skill for anyone navigating or building the web. This status code acts as a digital gatekeeper, informing you that the request lacks valid authentication credentials for the target resource. While it can be frustrating, the solution usually lies in a few specific areas of your browser or server configuration. How Do I Fix 401 Unauthorized Error?

If your credentials are correct, the issue often resides in your browser's stored data. Browsers use cookies and cache to keep you logged into websites, but these files can become corrupted or outdated. When a website tries to use an old cookie to authenticate you, the server may reject it with a 401 error. Clearing your browser’s cache and cookies forces the site to request a fresh login, often resolving the communication gap between your computer and the server. The most common cause of a 401 error