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Update troubleshoot-windows-update-error-0x80072f8f.md
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support/windows-server/installing-updates-features-roles/troubleshoot-windows-update-error-0x80072f8f.md

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## Summary
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When trying to connect to Windows Update, you encounter error 0x80072f8f. This error usually indicates issues with SSL negotiation due to out-of-sync clock settings or untrusted SSL certificates.
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When you try to connect to Windows Update, you encounter error 0x80072f8f. This error typically indicates issues that affect SSL negotiation because of out-of-sync clock settings or untrusted SSL certificates.
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:::image type="content" source="./media/troubleshoot-windows-update-error-0x80072f8f/updateerror0x80072f8f-wusaerror.png" alt-text="Windows Update error 0x80072f8f" lightbox="media/troubleshoot-windows-update-error-0x80072f8f/updateerror0x80072f8f-wusaerror.png":::
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## Prerequisites
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Ensure you back up the OS disk. For more information, see [About Azure Virtual Machine restore](/azure/backup/about-azure-vm-restore).
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Make sure that you back up the OS disk. For more information, see [About Azure Virtual Machine restore](/azure/backup/about-azure-vm-restore).
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## How to identify the issue
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### Symptom 1
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Windows Update fails with error 0x80072f8f. Check the `WindowsUpdate.log` located at *C:\Windows\Logs\WindowsUpdate* for entries similar to the following one:
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Windows Update fails and returns error 0x80072f8f. Check the `WindowsUpdate.log` located at *C:\Windows\Logs\WindowsUpdate* for entries that resemble the following entry:
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```output
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03E4 1668 SLS Making request with URL HTTPS://sls.update.microsoft.com/SLS/{9482F4B4-E343-43B6-B170-9A65BC822C77}/x64/10.0.14393.0/0?CH=531&L=en-US&P=&PT=0x7&WUA=10.0.14393.1794
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### Symptom 2
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When you download updates from Windows Update, there's no progress. The `WindowsUpdate.log` shows failures on WinHTTP requests to `SLS.Update.Microsoft.com`:
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When you try to download updates from Windows Update, you see no progress. The `WindowsUpdate.log` shows failures on WinHTTP requests to `SLS.Update.Microsoft.com`:
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```output
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2032 2248 ComApi * START * Federated Search ClientId = Device Driver Retrieval Client (cV: xXbBtDYuUUOnH3AK.1.0)
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### Symptom 3
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When you check for updates from Windows Update, there's no progress. The `WindowsUpdate.log` indicates `HTTP Send Request failed with 0x80072f8f (WININET_E_DECODING_FAILED)`:
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When you check for updates from Windows Update, you see no progress. The `WindowsUpdate.log` indicates `HTTP Send Request failed with 0x80072f8f (WININET_E_DECODING_FAILED)`:
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```output
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7452 3228 Misc *FAILED* [80072F8F] Send request
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This error is usually caused by one of the following issues:
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- **Out-of-sync clock**: If the clock settings on the computer are incorrect, SSL negotiation fails. You can quickly verify clock accuracy from `WindowsUpdate.log` that always prints traces in local time.
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- **Untrusted SSL certificate**: In managed scenarios with Windows Server Update Services (WSUS) or Configuration Manager configured over SSL with self-generated or signed SSL certificates, if the client doesn't trust the certificate chain, the scan fails.
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- **Untrusted SSL certificate**: In managed scenarios for Windows Server Update Services (WSUS) or Configuration Manager that's configured over SSL and includes self-generated or signed SSL certificates, the scan fails if the client doesn't trust the certificate chain.
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## Resolution
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Perform an [in-place upgrade](/azure/virtual-machines/windows-in-place-upgrade) on the Windows virtual machine (VM).
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Perform an [in-place upgrade](/azure/virtual-machines/windows-in-place-upgrade) on the Windows virtual machine (VM).

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