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WU_E_DM_BITSTRANSFERERROR
WU_E_DM_BITSTRANSFERERROR is a wrapper for a BITS transfer failure. The useful diagnostic evidence is the job-level BITS or underlying network error logged with the same update attempt.
How to investigate
- Inspect the Windows Update log for the update ID and any nested HTTP, proxy, or BITS status.
- Check whether the failure affects all downloads or only content from one update source.
- Correlate the event with proxy, firewall, TLS inspection, VPN, or network loss before resetting update components.
Microsoft: Windows Update error reference
Microsoft: Background Intelligent Transfer Service (BITS)
Microsoft: Windows Update log files
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