An Error Occurred During Logon 0xc000035b

Encountering the error message "an error occurred during logon 0xc000035b" can be frustrating, especially when you are trying to access your Windows system. This error typically indicates issues with user authentication, which can arise from various factors such as corrupted user profiles, domain issues, or system file corruption. In this comprehensive guide, we will explore the causes, symptoms, and solutions related to this error, providing you with the knowledge you need to resolve it effectively.

Understanding the Error Code 0xc000035b

The error code 0xc000035b is a Windows error that often appears during the logon process. It signifies that the system encountered a problem while trying to authenticate the user. This can happen in various scenarios, such as when a user is attempting to log into a domain-joined computer or a local account. Understanding the underlying causes of this error is crucial for troubleshooting.

Common Causes of the Error

Several factors can lead to the occurrence of the error code 0xc000035b. Here are some of the most common causes:

Corrupted User Profile: A damaged user profile can prevent successful logon attempts.
Domain Issues: Problems with the domain controller or network connectivity can trigger authentication errors.
System File Corruption: Corrupted system files can interfere with the logon process.
Incorrect Credentials: Entering the wrong username or password may also lead to this error.
Group Policy Changes: Recent changes in group policies may affect user authentication.

Symptoms of the Error

When you encounter the error code 0xc000035b, you may experience various symptoms that indicate a problem with the logon process. These symptoms include:

Inability to log into your Windows account.
Frequent prompts for username and password.
System freezes or crashes during logon attempts.
Error messages indicating failure to authenticate.

Troubleshooting Steps for Error 0xc000035b

Resolving the error code 0xc000035b involves a series of troubleshooting steps aimed at identifying and fixing the underlying issues. Below are detailed methods you can follow:

1. Restart Your Computer

The first step in troubleshooting any error is to restart your computer. A simple reboot can resolve temporary glitches that may be causing the logon error.

2. Check Network Connection

If you are logging into a domain, ensure that your computer is connected to the network. A weak or unstable connection can lead to authentication failures.

3. Use Safe Mode

Booting your computer in Safe Mode can help you identify if third-party applications or services are causing the issue. To enter Safe Mode:

Restart your computer and press F8 before Windows starts.
Select "Safe Mode" from the Advanced Boot Options menu.
Log in with your credentials and check if the error persists.

4. Create a New User Profile

If your user profile is corrupted, creating a new one can resolve the issue. You can do this by:

Boot into Safe Mode.
Open the Control Panel and navigate to "User Accounts."
Select "Manage another account" and click "Add a new user in PC settings."
Follow the prompts to create a new account.

5. Restore System Files

Using the System File Checker (SFC) tool can help repair corrupted system files. To run SFC:

Open Command Prompt as an administrator.
Type sfc /scannow and press Enter.
Wait for the scan to complete and follow any on-screen instructions.

6. Check Group Policy Settings

If recent changes were made to Group Policy, review those settings to ensure they are not affecting user authentication. You can access Group Policy Editor by typing gpedit.msc in the Run dialog.

7. Reset Password

If you suspect that incorrect credentials are the issue, try resetting your password. This can be done through the Windows login screen or via the Control Panel if you have access to another account.

8. Check Event Viewer

The Event Viewer can provide valuable insights into the errors occurring during logon attempts. To access Event Viewer:

Press Windows + R to open the Run dialog.
Type eventvwr.msc and press Enter.
Navigate to "Windows Logs" and check the "Application" and "System" logs for error messages related to logon failures.

Advanced Solutions for Persistent Issues

If the basic troubleshooting steps do not resolve the error, consider the following advanced solutions:

1. System Restore

If you recently installed new software or updates that may have caused the issue, performing a System Restore can revert your system to a previous state. To do this:

Type rstrui.exe in the Run dialog and press Enter.
Follow the prompts to select a restore point and complete the process.

2. Repair Installation

If the problem persists, a repair installation of Windows can fix system files without affecting your personal data. You will need a Windows installation media to perform this action.

3. Reinstall Windows

As a last resort, if none of the above solutions work, you may need to consider a complete reinstallation of Windows. Be sure to back up your data before proceeding with this option.

Preventing the Error in the Future

To minimize the chances of encountering the error code 0xc000035b in the future, consider the following preventive measures:

Regularly update your operating system and software to patch vulnerabilities.
Run regular system maintenance, including disk cleanup and defragmentation.
Back up your important data frequently to avoid data loss.
Maintain a secure and stable network connection, especially for domain-joined computers.

Conclusion

Experiencing "an error occurred during logon 0xc000035b" can be a significant disruption to your daily tasks. However, by understanding the causes and following the troubleshooting steps outlined in this guide, you can effectively resolve the issue and regain access to your Windows system. Remember to take preventive measures to avoid encountering this error in the future. If you found this guide helpful, please share it with others who may benefit from it!

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