What is WU-0x800f0922?
Windows Update Error 0x800f0922 (WU-0x800f0922) is a high-severity fault affecting the Windows operating system. Windows Update fails to install, typically caused by insufficient space in the System Reserved or EFI System Partition (ESP), Secure Boot configuration conflicts, or active VPN connection blocks. Follow the steps below to fix it.
Common Causes
- The EFI System Partition (ESP) has run out of allocated space for boot configuration files.
- Secure Boot is disabled or configured incorrectly in the UEFI motherboard settings.
- An active VPN connection or proxy is blocking communication with Microsoft Update servers.
Step-by-Step Fix Guide
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1
Disconnect from any active VPN client or proxy server and try running the update again.
"Disconnect from any active VPN client or proxy server and try running the update again." targets an active VPN connection or proxy is blocking communication with Microsoft Update servers, one of the documented causes of WU-0x800f0922.
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2
Verify Secure Boot is enabled in your BIOS/UEFI settings to allow system update validation.
"Verify Secure Boot is enabled in your BIOS/UEFI settings to allow system update validation." is worth trying when the EFI System Partition (ESP) has run out of allocated space for boot configuration files turns out to be the culprit.
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3
Extend or clean up the EFI System Reserved Partition (ESP) to ensure at least 15MB of free space.
"Extend or clean up the EFI System Reserved Partition (ESP) to ensure at least 15MB of free space." targets the EFI System Partition (ESP) has run out of allocated space for boot configuration files, one of the documented causes of WU-0x800f0922.
Commands & Diagnostics
net stop wuauserv
net start wuauserv
Frequently Asked Questions
The EFI System Partition (ESP) has run out of allocated space for boot configuration files accounts for the majority of WU-0x800f0922 reports; secure Boot is disabled or configured incorrectly in the UEFI motherboard settings and an active VPN connection or proxy is blocking communication with Microsoft Update servers come up less often but are documented.
The fastest fix is "Disconnect from any active VPN client or proxy server and try running the update again". Only move on to the later steps if WU-0x800f0922 keeps coming back.
Rated high severity — WU-0x800f0922 isn't immediately destructive, but recurring instances are a sign to fix it sooner rather than later.
You shouldn't need to. Work through the guide above first — a reinstall is only worth considering if none of those steps help.
Sometimes. Microsoft regularly releases patches that fix known BSOD triggers including WU-0x800f0922. Make sure Windows is fully up to date via Settings → Windows Update before attempting more advanced fixes.
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