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Are you getting a stop error code C000021B fatal system error message while using windows? Do you want to solve a C000021B error code without any cost? Therefore for the fixing of this error you can follow all these steps correctly. But before the fixing of this error code, you known about what does C000021B code mean? Or what are the main reasons behind this stop error code?

The windows stop error code C000021B is happens while critical system processes files to run, such as when you try to work with the winlogon.exe and csrss.exe processes and they have stop working. The windows stop error code also occurred when you try to inject a Net Buffer List, that contains multiple net buffers on the local computer system that is running windows 7 service pack 1or on the windows server 2008 R2 service pack 1. In this case the injection fails to run properly and furthermore you get FwpsInjectNetworkSendAsync0 method returns error code C000021B on the system screen problem. It only comes on the system when original NBL contains multiple NET_BUFFERs and it also occurs because of a faulty third party Graphical identification and authentication DLL which is replaceable DLL component that winlogon.exe loads and because an wrong algorithm is used to identify if all net buffers have the same IP header on the computer system.

  • The most common reason behind this error is installing incompatible or outdated driver, missing system files, corrupted registry file or damaged pc by viruses. Advanced System Repair Tool is the only solution for all the system errors. By installing this tool you will be able to remove above windows error.
    3 Steps to Fix this Error

    Step 1. Download Advance System Repair Tool [File Size: 15.7 MB]
    Step 2. SCAN your Windows PC
    Step 3. Click Fix button to Repair Error


There are many reasons behind this windows stop error code C000021B. Among them are the following:

  • Power supply unit that is required to replacement.
  • Malicious programs that are running into the computer system such as the virus infection, Trojan, malware, etc
  • A backup program that is used to restore a hard disk did not accurately restore files that might have been in use in the system.
  • If you install any service pack in your system then it has failed.
  • Mismatched computer system files have been installed recently.
  • Incompatible third party programs has been installed, it may also cause this kind of error.

Above these are the most common reasons behind this windows stop error code C000021B, so you required fixing this as far as possible or else you may face further more system problems or windows problems.

Easy ways to fix windows stop error code C000021B?

All the windows versions is use winlogon.exe and csrss.exe but if you have newly install any new drivers, system services or programs in windows, you possible encountered the stop error code C000021B because of the some changes in the system. So you can fix this through the help of third party repair tool, through the help of this tool you can also fix entire problem that can be related to this error code. Hence, it’s better to use third party repair tool to easily solve this error without any trouble or within couple of minutes only.

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Fixing error code C000021B in windows?

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