I did check the server after the next definition update was published and it did successfully install, so it’s quite likely the commands are enough to “clean up” the problem. Now it’s quite possible that the “next” definition update from WU causes an error again, so check the machine a week or so later to make sure that it is still installing definition updates without any errors. Windows Update then detected that it didn’t need to install the Defender update at all, and the Windows Update step completed after a single pass with no errors. With that done, the latest definition updates were installed prior to Windows Update. I then inserted that into my MDT task sequence prior to the Windows Update step: & “$($ENV:ProgramFiles)\Windows Defender\MpCmdRun.exe” -SignatureUpdate | Out-Host & “$($ENV:ProgramFiles)\Windows Defender\MpCmdRun.exe” -removedefinitions -dynamicsignatures | Out-Host That includes a section called “Trigger an update” that lets you update the Defender definitions using some simple commands. One approach suggested was to follow this Microsoft page: By itself, that code isn’t very useful since it just means “error 1603, fatal error during installation.” But the original 8050800C error code finds a variety of instances over the years. IT professionals can configure definition updates and cloud-based protection in Windows Defender in Windows 10 through Microsoft Active Directory and Windows. The 80070643 error code is what gets logged by MDT and shown on the Windows Update settings page. Looking at the WindowsUpdate.log, you can see three distinct error codes:ģ 22:09:22.3989998 9200 8576 Handler * START * Command Line Install Updates to install = 1ģ 22:09:27.7566112 9200 8576 Handler Command line install completed. the latest cumulative update, servicing stack, etc.). The same error occurs even after all other updates have successfully installed (e.g. When doing this as part of an MDT image creation task sequence, that failure ends up happening over and over again, as MDT detects the failure, reboots the computer, and then tries it again, only for it to fail again. I have been building Windows 10 images based on the Windows 10 20H2 media and seeing repeated failures on the “Security Intelligence Update for Microsoft Defender Antivirus – KB2267602” installation.
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