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WU_E_UH_REMOTEUNAVAILABLE
WU_E_UH_REMOTEUNAVAILABLE means Windows Update tried to hand work to a remote update handler process, but that process was not available when the install step started. This is an execution-stage problem, not a scan or download error.
What to check
- Generate
WindowsUpdate.logand find the update ID, handler name, and the stage where the remote process was expected. - If the same update fails repeatedly, reboot first and retry so that any pending servicing work can complete before the handler is started again.
- For component-based updates, also inspect
%windir%\Logs\CBS\CBS.logfor earlier servicing failures that prevented the handler from starting correctly.
Microsoft: Windows Update log files
Microsoft: Fix Windows Update corruptions and installation failures
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