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  1.    04 Apr 2017 #81
    Join Date : Oct 2014
    Arnold, MD
    Posts : 28,953
    Triple boot - Win 10 Pro, Win 10 Pro Insider (2) - (and a sprinkling of VMs)

    Just another piece of the puzzle. Keep in mind, mine is on 15063.14.

    Same ole ugly errors everywhere for Defender updates. Cannot use the direct link, DL'd file seems to do nothing when executed. Take this with a grain of salt, and I'm not suggesting this is a concrete solution, or 3rd party apps should be used, it just happened to work here. Using CCleaner, I checked off an option I never use, Windows Defender under Utilities. It cleans out Defender log files. After running CCleaner with this checked, WU processed normally, with no errors. No guarantee it won't get sick again, just that it worked this time. I've unchecked that entry for now to see what will happen going forward. Keep in mind, this is 15063.14, not 14393.969/970.

    Click image for larger version. 

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    EDIT: 7:55am - just checked on my lappy running 14393.969, and it seems ok now! Has def 1.239.774.0, but shows as failed in Reliability History. Weird.......
    Last edited by f14tomcat; 04 Apr 2017 at 06:58.
      My ComputersSystem Spec
  2.    04 Apr 2017 #82
    Join Date : Apr 2017
    Posts : 26
    Windows 10 Home 64 bit

    Thanks for the tip f14tomcat...

    I just used CCleaner to clear out the Windows Defender logs. Will post back to see if the next definition update installs without an error.
      My ComputerSystem Spec
  3.    04 Apr 2017 #83
    Join Date : Jul 2015
    Posts : 107
    Windows 10 Pro x64

    This is not really a fix, it's a workaround. You are just manually downloading the definitions and installing them. That's my guess unless you are saying that everything is now working properly after you ran what you posted.

    Quote Originally Posted by Geosammy View Post
    I fixed "my" issue by executing the following command in cmd as admin:

    "%programfiles%\windows defender\mpcmdrun.exe" -signatureupdate -http



    This is where I found the command and it's posting.
    Attachment 128154

    Use the link below,
    to review the post shown in my screenshot above.

    Definition Update for Windows Defender - KB2267602 Definition - Microsoft Community
      My ComputerSystem Spec
  4.    04 Apr 2017 #84
    Join Date : Oct 2014
    Oklahoma City
    Posts : 271
    Windows 10 1703 Build 15063

    Did not work for me. This is a Microsoft problem I think and I am going to use Avast temporarily until they get it fixed. Another MS fiasco!
      My ComputerSystem Spec
  5.    04 Apr 2017 #85
    Join Date : Apr 2017
    Posts : 26
    Windows 10 Home 64 bit

    The CCleaner tip did not work. Just got this:

    There were problems installing some updates, but we'll try again later. If you keep seeing this and want to search the web or contact support for information, this may help:

    Definition Update for Windows Defender - KB2267602 (Definition 1.239.778.0) - Error 0x80070643
      My ComputerSystem Spec
  6.    04 Apr 2017 #86
    Join Date : Apr 2017
    Posts : 7
    Win10 Pro x64

    What I've done is create scheduled event that runs at user logon (delayed start for 15 minutes) spawning a batch file that contains "%programfiles%\windows defender\mpcmdrun.exe" -signatureupdate -http

    Problem solved until MS fixes what they broke. I can run the bat file any time I want if I wish to update the definitions without waiting for the next time I start Windoze <tm>
      My ComputerSystem Spec
  7.    04 Apr 2017 #87
    Join Date : Feb 2016
    Phoenix, AZ
    Posts : 243
    Windows 10 Pro 1709 16299.19

    Quote Originally Posted by Geosammy View Post
    I fixed "my" issue by executing the following command in cmd as admin:

    "%programfiles%\windows defender\mpcmdrun.exe" -signatureupdate -http



    This is where I found the command and it's posting.
    Attachment 128154

    Use the link below,
    to review the post shown in my screenshot above.

    Definition Update for Windows Defender - KB2267602 Definition - Microsoft Community


    No Joy for me - It said No updates needed ?
      My ComputersSystem Spec
  8.    04 Apr 2017 #88
    Join Date : Oct 2014
    Oklahoma City
    Posts : 271
    Windows 10 1703 Build 15063

    Hey, folks - it's a Microsoft problem. Not worth our time and effort to try to fix their problem. We just have to work around them by using 3rd party anti-virus or waiting until they decide to fix it, hoping we don't get infected in the meantime.
      My ComputerSystem Spec
  9.    04 Apr 2017 #89
    Join Date : Apr 2017
    Tennessee
    Posts : 32
    Windows 10 Home/64bit

    Windows Update/Windows Defender


    Still have the problem here on the East Coast.
    Click image for larger version. 

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    Click image for larger version. 

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    Funny thing is, Windows Defender is reporting a connection failure and yet I'm able to post this.
    This reminds me of when they broke Windows 7 Update.
      My ComputerSystem Spec
  10.    04 Apr 2017 #90
    Join Date : Apr 2017
    Posts : 7
    Win10 Pro x64

    Quote Originally Posted by storageman View Post
    No Joy for me - It said No updates needed ?
    Even though mpcmdrun.exe is telling you that no update is needed, it probably did download the signatures and installed them. Check the update tab inside of Windows Defender and you should notice they are now current and any error returned in Windows Update will now disappear if you recheck for updates.
      My ComputerSystem Spec

 
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