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WU_E_URL_TOO_LONG
WU_E_URL_TOO_LONG means the Windows Update Agent rejected a URL because its length exceeded the supported limit. This can come from malformed update metadata, repeated redirects, query-string expansion, or broken proxy rewriting.
What to check
- Capture the final URL and redirect chain from the client and server logs.
- Check custom publishing, WSUS metadata, or proxy rules that append parameters or duplicate path segments.
- Fix the source of the oversized URL; clearing local update state alone does not correct malformed content metadata.
Microsoft: Windows Update log files
Microsoft: Windows Update Agent API reference
Microsoft: Windows Update error reference
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