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0x80240021UpdateMedium

Error 0x80240021 — WU_E_TIME_OUT | Windows Update Fix

Windows 10Windows 11

What Does 0x80240021 Mean?

The operation timed out.

Real-World Causes

  1. 1Server not responding
  2. 2Network timeout

Symptoms

  • ⚠Windows Update fails with error code 0x80240021
  • ⚠Update progress may stall or roll back
  • ⚠Repeated update attempts fail with the same error

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Run the Windows Update Troubleshooter (Settings > System > Troubleshoot > Other troubleshooters)
  2. 2Restart your computer and try Windows Update again
  3. 3Check your internet connection and ensure it is stable
  4. 4Free up disk space — at least 20 GB on the system drive
  5. 5Run 'sfc /scannow' in an elevated Command Prompt

Advanced Fix

For experienced users and IT professionals

  1. 1Run 'DISM /Online /Cleanup-Image /RestoreHealth'
  2. 2Reset Windows Update components: stop wuauserv, cryptSvc, bits, msiserver services, rename SoftwareDistribution and catroot2 folders, restart services
  3. 3Check the WindowsUpdate.log (Get-WindowsUpdateLog in PowerShell) for detailed error information
  4. 4Try downloading the update manually from the Microsoft Update Catalog

Frequently Asked Questions

What does 0x80240021 mean?
The operation timed out.
How do I fix 0x80240021?
Start by running the Windows Update Troubleshooter. If that doesn't work, try resetting Windows Update components and running DISM and SFC scans.

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.