This is typically due to a mistyped password, but it can also be caused by an incorrect username, connecting to the wrong server, or blacklisting. Follow these steps to resolve the issue: Reset your email password. A 404 error message means that a resource (webpage) no longer exists. If you see a 404 error for a specific URL in your Google Search Console account, it is because the URL is redirecting to a page that no longer exists. This may occur if the page was deleted, or the page URL was changed.