The 401 Unauthorized error code is an HTTP status code that is found when you are trying to access a page that cannot load the login request until you first enter a valid user ID and password. If you’ve just logged in and received the 401 Unauthorized error, it means that the credentials you entered were invalid for some reason.
The 401 error may occur due to the reasons described below:
- It may occur client does not provide the proper authentication credentials to the server within the request time.
- It may occur when the server rejects the request of the client for some reasons even though the client provides proper authentication credentials.
- When the client is banned for some reasons by the server.
401 Unauthorized error messages are often customized by each website, especially very large ones, so keep in mind that this error may present itself in more ways than these common ones:
- 401 Unauthorized
- Authorization Required
- HTTP Error 401 – Unauthorized
The 401 Unauthorized error displays inside the web browser window, just as web pages do. Like most errors like these, you can find them in all browsers that run on any operating system.
How to Fix the 401 Unauthorized Error
- Check The URL: Due to manual errors in typing the URL, the 401 unauthorized error may occur. Check for errors in the URL. It’s possible that the 401 Unauthorized error appeared because the URL was typed incorrectly or the link that was selected points to the wrong URL — one that is for authorized users only.
- Flush the DNS: Errors in DNS also creates 401 error status sometimes. Therefore, clearing the DNS will also rectify this error. In Windows, the DNS can be flushed by typing ipconfig/flushdns in the command prompt and clicking on ENTER.
- Login to the Website’s Homepage: If you’re sure the URL is valid, visit the website’s main page and look for a link that says Login or Secure Access. Enter your credentials here and then try the page again. If you don’t have credentials or have forgotten yours, follow the instructions provided on the website for setting up an account or resetting your password.Do you usually struggle to remember your passwords? Consider keeping them in a password manager so that you only have to remember one password.
- Reload the page: As simple as it might seem, closing down the page and reopening it might be enough to fix the 401 error, but only if it’s caused by a misloaded page.
- Clear Browser Cookie: In some situations, the cookies may not work smoothly leading to the improper server authentication. Thus, by clearing the cookies, the error can be rectified. There might be invalid login information stored locally in your browser that’s disrupting the login process and throwing the 401 error. Clearing the cache will remove any problems in those files and allow the page to download fresh files directly from the server.
- Website mistake: A few times all the above things are good or accurate but still you will get the 401 Unauthorized Error, that is mistake of the website. That time you need to contact the webmaster of that website and inform that the server is down. You can email them at
firstname.lastname@example.org the webmaster.com with the website or you can see the contact us option on any website through that you can inform them.
Other Ways You Might See 401 Errors
Web servers running Microsoft IIS might give more information about the 401 Unauthorized error, such as the following:
|Microsoft IIS 401 Error Codes|
|401.2||Logon failed due to server configuration.|
|401.3||Unauthorized due to ACL on resource.|
|401.4||Authorization failed by filter.|
|401.5||Authorization failed by ISAPI/CGI application.|
|401.501||Access Denied: Too many requests from the same client IP; Dynamic IP Restriction Concurrent request rate limit reached.|
|401.502||Forbidden: Too many requests from the same client IP; Dynamic IP Restriction Maximum request rate limit reached.|
|401.503||Access Denied: the IP address is included in the Deny list of IP Restriction|
|401.504||Access Denied: the host name is included in the Deny list of IP Restriction|