Before we look into potential solutions, let’s talk about the reasons that may be responsible for throwing the 401 error code and keeping the software development firms busy. 

Typos in URLs

We’ve all mistyped a URL at some point. One misspelled or missing character in the address bar can direct you to the wrong site or nowhere at all. When you try to access a page that’s been deleted or moved. Even if the URL looks right, it might be outdated. In both situations, the server can block your request and respond with a 401 error, thinking you’re not authorized to view the resource.

Expired Cache And Cookies

Cookies and cache help speed up your browsing and remember your login status. But if your cookies expire or the cache turns outdated or corrupted, things can go south. As cookies often store authentication details, any issue with them can lead to a 401 unauthorized error that makes it look like you’re not logged in even if you were a minute ago.

Firewall And Plugin Issues

Installed a new plugin or firewall? Sometimes, these tools get a bit overprotective. Security plugins might block access to parts of your site—even for admins—if they detect unusual login attempts or activity. Misconfigured plugins can mistake legitimate users for threats, resulting in unexpected 401 errors.

Restricted URLs

Some URLs are intentionally limited to authorized users only. If you try to access one of these from a browser that isn’t recognized or authenticated, the server might deny access and throw a 401 error.

.htaccess Rules

If your site employs a .htaccess file with password protection and you don’t have the right credentials, you will be locked out. The server will immediately return a 401 error, signaling unauthorized access.