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WU_E_DM_FAILTOCONNECTTOBITS
WU_E_DM_FAILTOCONNECTTOBITS indicates that the download manager could not establish its required connection to BITS. This is a local service-path failure before the update content transfer can proceed.
What to check
- Verify the BITS service state and inspect System and Windows Update logs from the same timestamp.
- Check for a service-start, dependency, permission, or component-registration failure that predates the Windows Update error.
- After fixing the BITS issue, run a new scan or download; do not assume the original job can resume intact.
Get-Service bits, wuauserv
Microsoft: Windows Update error reference
Microsoft: Background Intelligent Transfer Service (BITS)
Microsoft: Windows Update log files
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