How to solve the error code 0x8024401c: Windows Update encountered an unknown error in Windows Server 2019

There are several steps you can take to solve the error code 0x8024401c in Windows Server 2019:

1. Check your internet connection: Ensure that your server is connected to the internet and that there are no connectivity issues.
2. Restart the Windows Update service: Open the Services app and locate the Windows Update service. Right-click on it and select Restart.
3. Run the Windows Update troubleshooter: Open the Settings app and go to Update & Security > Troubleshoot. Select Windows Update and click on Run the troubleshooter.
4. Clear the Windows Update cache: Open the Command Prompt as an administrator and run the following commands:

net stop wuauserv

net stop cryptSvc

net stop bits

net stop msiserver

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

ren C:\Windows\System32\catroot2 catroot2.old

net start wuauserv

net start cryptSvc

net start bits

net start msiserver

5. Disable third-party antivirus software: Temporarily disable any third-party antivirus software you have installed and try running Windows Update again.
6. Check for system file corruption: Open the Command Prompt as an administrator and run the following command:

sfc /scannow

This will scan your system for any corrupted system files and attempt to repair them.

7. Perform a system restore: If none of the above steps work, you may need to perform a system restore to a previous point in time when Windows Update was working correctly.