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  1.    04 Apr 2017 #1
    Join Date : May 2016
    Posts : 764
    Windows 10 Pro

    Defender update loop


    I keep getting this update failure for Defender: Definition Update for Windows Defender - KB2267602 (Definition 1.239.797.0) - Error 0x80070643

    I used to be able to update Defender manually and then recheck the "update/security" of all settings and it would come back clean.

    Anybody have any idea why this is happening and how to resolve it? Going on 3 days now and it's starting to piss me off.
      My ComputerSystem Spec
  2.    04 Apr 2017 #2
    Join Date : Oct 2013
    Posts : 25,285
    64-bit Windows 10 Pro build 17046

    Hello Plankton,

    To get your machine back to a protected state, you can manually download and apply the latest Windows Defender definition update by following the instructions outlined here:

    Get the latest definitions - Microsoft Malware Protection Center
    Last edited by Brink; 04 Apr 2017 at 17:52.
      My ComputersSystem Spec
  3.    04 Apr 2017 #3
    Join Date : May 2016
    Posts : 764
    Windows 10 Pro
    Thread Starter

    Thanks...I'll give that a go.
      My ComputerSystem Spec
  4.    04 Apr 2017 #4
    Join Date : Jul 2015
    Florida
    Posts : 210
    Windows 10 Pro 64-bit

    It's an issue that MS is going to fix:

    http://www.thewindowsclub.com/window...tes-0x80070643
      My ComputerSystem Spec
  5.    04 Apr 2017 #5
    Join Date : May 2016
    Posts : 764
    Windows 10 Pro
    Thread Starter

    Thanks bobby (Hill)....lol. I've sent in a feedback report on it. In the meantime I just decided to go with a free AV until it's fixed or I'll wait until the creators Update is released and just do a clean install with that. Nothing like starting from scratch.
      My ComputerSystem Spec
  6.    04 Apr 2017 #6
    Join Date : Aug 2016
    S/E England
    Posts : 4,526
    10 Home x64 (1709) (10 Pro on 2nd pc)

    Quote Originally Posted by Bobby Phoenix View Post
    It's an issue that MS is going to fix...
    @jyim89, one of the ' Microsoft Windows Defender Team' has registered on TenForums to let us know...
    https://www.tenforums.com/search.php?searchid=2017824
    ...and to ask for our logs to help them diagnose the problem.
    Windows 10 Update March 31 2017
      My ComputersSystem Spec
  7.    04 Apr 2017 #7
    Join Date : May 2016
    Posts : 764
    Windows 10 Pro
    Thread Starter

    Thanks Bree....I PM'd jyim89 as requested in that 2nd link. The first link is broken, all I get is "sorry no matches. Please try some different terms"
      My ComputerSystem Spec
  8.    04 Apr 2017 #8
    Join Date : Apr 2017
    Posts : 20
    Windows 10

    Quote Originally Posted by Plankton View Post
    Thanks Bree....I PM'd jyim89 as requested in that 2nd link. The first link is broken, all I get is "sorry no matches. Please try some different terms"
    Thanks for your PM. Since I'm new to the forums I cannot directly respond back to you. We don't need any more logs at this point. We are working as quickly as we can to get a fix out. Meanwhile please manually obtain the latest definition update from following the instructions outlined on this link: Get the latest definitions - Microsoft Malware Protection Center.
    Please keep in mind these manual updates run silently so you can verify you have updated through the Defender client UI.
      My ComputerSystem Spec
  9.    04 Apr 2017 #9
    Join Date : Feb 2016
    Posts : 21
    Windows 10 Pro 64bit 1709 / 16299.64

    This fixed the issue for me...


    Quote Originally Posted by Brink View Post
    Hello Plankton,

    To get your machine back to a protected state, you can manually download and apply the latest Windows Defender definition update by following the instructions outlined here:

    Get the latest definitions - Microsoft Malware Protection Center
    I got into this WD Update loop today after today's 'Cumulative Update for Windows 10 Version 1607 for x64-based Systems (KB4015438)' on both desktop and laptop.

    After a successful manual WD update, it now says, 'Your device is up to date. Last checked: Today, ‏‎3:10 PM'

    Thanks Brink!
      My ComputersSystem Spec
  10.    05 Apr 2017 #10
    Join Date : Apr 2017
    Posts : 20
    Windows 10

    For those who have been experiencing the Windows Defender update error 0x80070643 recently, please check my latest update to the thread On Windows Defender Definition Update error 0x80070643.
      My ComputerSystem Spec

 
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