When working with a server, quite often the need arises to configure the correct operation of the HTTP protocol. Undoubtedly, both experienced administrators and newbies may experience difficulties. Speaking specifically about the 401 (Unauthorized) error, this is one of the most common HTTP responses, which indicates that the requested resource requires authentication. In this article, we will look at what a 401 error means, its causes and, most importantly, effective ways to solve it.
What is a 401 – Unauthorized error?
Error 401 – Unauthorized means that the user or client trying to access a resource on the web server is not authenticated or has insufficient access rights. The server expects the client to provide the correct credentials (login and password) to access the requested resource.
Reasons for the 401 error
- Incorrect Credentials. The Client may provide an incorrect login or password.
- Missing Credentials. The client has not provided any credentials to access the resource.
- Insufficient access rights. The client’s credentials may be correct, but the client does not have rights to access a specific resource.
- Errors in server settings. Incorrect server configuration can result in a 401 error.\
Effective ways to solve 401 – Unauthorized error
Credential verification
The first and most obvious measure when a 401 error occurs is to make sure that the login and password entered are correct. If you’re sure your credentials are correct but still encounter an error, try resetting your password and re-entering it. Verifying that authentication tokens are correct also requires extra care on your part. Modern web applications often use tokens (such as JWT) to authenticate users. Credential verification includes:
- Token Renewal: Tokens have an expiration date after which they expire. Verifying the token and updating it can restore access.
- Token Validity: Ensure that the token is intact and correctly formed
Checking authentication settings on the server
Server administrators should review the authentication configuration on the web server. Make sure that all required authentication modules are enabled and configured correctly. For example, an Apache server might require the mod_auth_basic or mod_auth_digest modules.
Setting access rights
Check the access rights to the requested resource. Make sure that the account under which the request is made has sufficient rights to access this resource. If necessary, make changes to the server configuration file or access control system settings.
Rebooting the server and clients
Such banal inactions can also be the cause of this error. In some cases, simply rebooting the server or client may resolve the issue. This may help update the configuration and resolve temporary errors.
Clearing your browser cache and cookies
In some cases, the 401 error may be caused by outdated or corrupt cookies or cache data in the browser. Clear your browser’s cache and cookies and try accessing the resource again.
Using Anonymous Browser Modes
Try accessing the resource in incognito mode or in the private mode of your browser. This will help determine whether the problem is related to browser settings or credentials. By providing a high level of security, privacy and confidentiality, AlexHost is committed to protecting its customers. You will be able to use anonymous browsers, which will increase your privacy and also get offshore service using our services.
Software update
Make sure all components of your web server and client application are updated to the latest versions. Sometimes errors can be caused by bugs that have already been fixed in newer versions of the software.
Checking API Configuration
If you’re working with an API, make sure your client request is properly configured to send credentials. Include the required authentication headers (for example, Authorization: Bearer <token>) in your API request.
