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WU_E_LEGACYSERVER
WU_E_LEGACYSERVER means the operation cannot be completed because the update server is too old for the client capability or requested protocol path.
What to check
- Identify the WSUS or update service version that the client is using.
- Check whether the client was upgraded while the managed update infrastructure remained at an older compatibility level.
- Upgrade or reconfigure the server-side service rather than trying to suppress the error on the client.
Microsoft: Configure Group Policy settings for Automatic Updates
Microsoft: Windows Update log files
Microsoft: WUA success and error codes
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