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Overview

If you try to run Windows Updates and get an Error 80072EFD, you may have failed/stuck updates.


One possible fix (worked for me)

Stop BITS and Windows Update services:

net stop bits
net stop wuauserv

Flush DNS Cache

Ipconfig /flushdns

Delete broken update files in C:\Users\All Users\Microsoft\Network\Downloader

cd "C:\Users\All Users\Microsoft\Network\Downloader"
del qmgr0.dat
del qmgr1.dat

Restart BITS and Windows Update services:

net start bits
net start wuauserv


Reference

http://www.sevenforums.com/windows-updates-activation/296573-cant-update-windows-server-clients-error-80072efd.html 3rd Post (ermess)