How to resolve error code 0x8024401c: Windows Update faced an unknown issue on Windows Server 2016

Here are some steps you can follow to resolve the error code 0x8024401c on Windows Server 2016:

1. Verify your internet connection: Ensure your server is online and there are no connectivity problems.
2. Restart the Windows Update service: Launch the Services app, find the Windows Update service, right-click it, and choose Restart.
3. Turn off third-party antivirus software: Antivirus software from other vendors can sometimes disrupt Windows Update. Temporarily disable your antivirus program and try running Windows Update again.
4. Run the Windows Update troubleshooter: Open the Settings app and navigate to Update & Security > Troubleshoot. Choose Windows Update and select Run the troubleshooter.
5. Clear the Windows Update cache: Open Command Prompt as an administrator and input these 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

6. Manually check for updates: Open the Settings app and head to Update & Security > Windows Update. Click on Check for updates and wait for the process to finish.