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.

Thanks...I'll give that a go.

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

http://www.thewindowsclub.com/window...tes-0x80070643

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.

Bobby Phoenix said:

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

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"

Plankton said:

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.

Brink said:

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!

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.