question

carlomendoza avatar image
27 Votes"
carlomendoza asked ChristopherSzabo-2832 commented

Can't connect to any VPN after today's Windows Updates / Windows 11

I'm now getting this error trying to connect to VPN on Windows 11: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

I've noticed this on 2 Windows 11 laptops (one personal and another for work). Both have been updated today and no longer able to connect to a couple VPNs.

2022-01 Cumulative Update for Windows 11 for x64-based Systems (KB5009566)

Anyone else? Anyone know how to fix it other than uninstalling the update?

windows-11
· 28
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So today I was near to shot my head, same problem with windows 10 uninstall kb5009543 and everything will work again. First I uninstall kb5008876 but no effect, then....


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9 Votes 9 ·
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remoteitguy44-8438 avatar image remoteitguy44-8438 ThunderSolutions-2910 ·

Thanks for the post. Same problem with Windows 10. I removed kb5009543 and my VPNs started to work again. It cost me a very important meeting as I was fighting with my laptop trying to get things functioning. The fact that Microsoft still pushes out updates like this after well over 20 years of patch screw-ups like this is not surprising.

5 Votes 5 ·

Thank you! This worked. Also for anyone wondering how to uninstall the windows update, you can follow this guide if you don't want to use powershell: https://www.tomsguide.com/how-to/how-to-uninstall-a-windows-10-update

0 Votes 0 ·
BirdmanAnnoyed-7785 avatar image BirdmanAnnoyed-7785 ThunderSolutions-2910 ·

How did you uninstall 5009543 ??


I try and it tells me its a required update and cannot be uninstalled.

1 Vote 1 ·
IkhsanC-2991 avatar image IkhsanC-2991 BirdmanAnnoyed-7785 ·

TRY THIS:
1. OPEN POWERSHELL (ADMINISTRATOR)
2. TYPE> WMIC QFE LIST BRIEF /FORMAT:TABLE
3. TYPE> WUSA /UNINSTALL /KB:(NUMBER)

1 Vote 1 ·
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IkhsanC-2991 avatar image IkhsanC-2991 BirdmanAnnoyed-7785 ·

TRY to use this
1. OPEN POWERSHELL (ADMINISTRATOR)
2. TYPE> WMIC QFE LIST BRIEF /FORMAT:TABLE
3. TYPE> WUSA /UNINSTALL /KB:(NUMBER)

0 Votes 0 ·
beccodes avatar image beccodes ThunderSolutions-2910 ·

This worked for me, removed kb5009543 on windows 10 and rebooted and my VPN reconnected immediately. Pausing updates for a few weeks so Microsoft can repair this update....

0 Votes 0 ·
KetanTejani-4229 avatar image KetanTejani-4229 ThunderSolutions-2910 ·

Thanks for this post - I got same isssue and your post saved me from agonizing pain I would have gone through.

0 Votes 0 ·

THANK YOU!!!!
this finally worked and the VPN is connecting again, had to go through lots of hours researching just to find Microsoft singing Ups I did it again, GRRRR

0 Votes 0 ·

Just to say I had to remove KB5009543 & 2 other updates before the VPN would connect.

2 Votes 2 ·

Robert,

What were the other 2 updates you uninstalled and are you running Windows 10 or 11.

Cheers!
H

0 Votes 0 ·

This is happening not only in Windows 11 but in Windows 10 too. How can i fix this or downgrade?

0 Votes 0 ·

After a day of figuring out why the L2TP/IPSec PSK connection not working (till yesterday morning), I found the same: I had to remove KB5009543!
Unfortunatelly I can't hide this upgrade (or any other) from the update list like I did in Win7 for example.

BUT!I found this:
https://tweaks.com/windows/67132/how-to-block-specific-driver-or-patch-updates-in-windows-10/

It works!

0 Votes 0 ·

This KB article has been replaced by a useless FAQ that says your only choice is to suspend updates for 7 days.

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remoteitguy44-8438 avatar image
0 Votes"
remoteitguy44-8438 answered

Note that windows update will keep reinstalling this update. So it will keep breaking over and over until MS fixes the L2TP issue or pulls it completely.

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NavinKumar-6667 avatar image
0 Votes"
NavinKumar-6667 answered

You can take help from - How to Fix VPN KB5009543 Problem in Windows 10


and remove the update from Windows 11 by following- How to Uninstall KB5009566 from Windows 11


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kpackaging-7114 avatar image
0 Votes"
kpackaging-7114 answered CornSmiesing-5861 commented

I tried to unistall the #KB5009543 from command line (run as Administator) in Win10

 wusa /uninstall /kb:5009543

But the update isn't unistalled, as it says the update is important!!

Any workaround???


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Updated the info, kpackaging-7114, now you can follow for successful removal.

0 Votes 0 ·

the updated version still doesnt work safe boot or not

0 Votes 0 ·
LimitlessTechnology-2700 avatar image
0 Votes"
LimitlessTechnology-2700 answered remoteitguy44-8438 edited

Hi there,

This is a known issue with the update (KB5009566) ​and many users have reported this.

Windows 11 Update (KB5009566) inhibits VPN connection
https://techcommunity.microsoft.com/t5/report-an-issue/windows-11-update-kb5009566-inhibits-vpn-connection/m-p/3057844

You can report this to Microsoft.The Feedback Hub app lets you tell Microsoft about any problems you run into while using Windows 10. You can also send suggestions to help us improve your Windows experience.https://support.microsoft.com/en-us/windows/send-feedback-to-microsoft-with-the-feedback-hub-app-f59187f8-8739-22d6-ba93-f66612949332



--If the reply is helpful, please Upvote and Accept it as an answer--

· 1
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Great timing on Microsoft's part considering the amount of remote work folks are doing these days to break both Win10 and Win11 with an update like this.

1 Vote 1 ·
IvanPololi-9039 avatar image
0 Votes"
IvanPololi-9039 answered

Hello,

uninstalling kb5009543 worked also for me on windows 10.

Ivan

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KirtPutman-7652 avatar image
0 Votes"
KirtPutman-7652 answered

Same issue removing KB5009543 fixed the issue.

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RickChaisse-8925 avatar image
1 Vote"
RickChaisse-8925 answered RickChaisse-8925 published

Problem: Microsoft had installed an update that knocked out the L2TP VPN connection.
Solution: Open an administrative command prompt.
Type: wusa /uninstall /kb:5009543 for Windows 10
Type: wusa /uninstall /kb:5009566 for Windows 11

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BBMADSEN-6671 avatar image
0 Votes"
BBMADSEN-6671 answered BBMADSEN-6671 commented

KB5009543 issue

cmd as admin - wusa /unistall /KB:5009543

Commands do not work in win 10 pro 21h2 build 19044.1466
-important update
Tryed all of this as well - https://www.howto-connect.com/fix-vpn-kb5009543-windows-10/

Any help?

· 4
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check your command, it's uninstall, not unistall

Type: wusa /uninstall /kb:5009543 for Windows 10
Type: wusa /uninstall /kb:5009566 for Windows 11

0 Votes 0 ·

Spelling sorry 165030-udklip.png


0 Votes 0 ·
udklip.png (77.6 KiB)

I also can't uninstall this update..
I have the same msg "...this update is required by computer and can not be uninstalled"
Win 10 Pro 20H2 19042.1466

0 Votes 0 ·
BBMADSEN-6671 avatar image BBMADSEN-6671 JerzyGrzanka-5731 ·

The update today did some magic ;-) Now we can use the VPN connection again .166014-vigtig-update.png


0 Votes 0 ·
vigtig-update.png (11.3 KiB)
Reza-Ameri avatar image
3 Votes"
Reza-Ameri answered remoteitguy44-8438 commented

Microsoft is aware of this issue and working on a fix for this issue as a workaround you may disable Vendor ID in the server side for your VPN (in case this option is available) or uninstall the update.
Here is the reference from the Microsoft:
https://support.microsoft.com/en-us/topic/january-11-2022-kb5009566-os-build-22000-434-eee797fa-5ee3-4501-aeec-db3bc73b2c7b

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remoteitguy44-8438 avatar image
0 Votes"
remoteitguy44-8438 answered

Since my comment was deleted for reasons.

For those that want to track windows 10 information regarding the patch:

https://support.microsoft.com/en-us/topic/january-11-2022-kb5009543-os-builds-19042-1466-19043-1466-and-19044-1466-b763552f-73bd-435a-b220-fc3e0bc9765b

Note that most consumer based VPN do not have the easy ability to disable vendor id.

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