L2TP VPN doesn't work with a USG Flex 200

mMontana

Zyxel_Tobias said:

Hi Tobias!

Currently, there is an ongoing issue with Windows Update!

Please try the following Hotfix:

https://support.zyxel.eu/hc/en-us/articles/4415084375954

Microsoft reported

"To mitigate the issue for some VPNs, you can disable Vendor ID within the server-side settings. Note: Not all VPN servers have the option to disable Vendor ID from being used,"

Any chance to submit a console command which can disable the Vendor ID in Zyxel firewalls?

Zyxel_Tobias

Hi,

no that is not possible with our devices.

mMontana

This is quite unfortunate and unpleasant.

Not blaming Zyxel for this but anyway... still sucks

NSIT

TobiasK said:

Can someone from Zyxel please give an update here? It must be more then me that have same problem? 

 I called ZyXel support and said same a couple of weeks ago when i started having the issue, i spent hours on the phone we got nowhere..

NSIT

Uninstal MS updates KB5008876, KB5009543, KB5009566. Worked for me...

Ian31

mMontana said:

This is quite unfortunate and unpleasant.

Not blaming Zyxel for this but anyway... still sucks

Hi All,
Yes, it sucks worldwide. 
Finally, Microsoft release the fix overcome the issue. Now you can get windows updated.

KB5010793 for Windows 10

https://support.microsoft.com/en-us/topic/january-17-2022-kb5010793-os-builds-19042-1469-19043-1469-and-19044-1469-out-of-band-f2d4f178-5b36-49cb-a6fd-4bf9857574f9

KB5010795 for Windows 11

https://support.microsoft.com/en-us/topic/january-17-2022-kb5010795-os-build-22000-438-out-of-band-2d2b9310-d845-41c4-9907-aeea24f36a63

mMontana

At least for me it worked. KB5010793 is related to Windows 10, so Windows 11 update should be a different one

Zyxel_Tobias

Hi,

we also confirm it´s working now.

https://support.zyxel.eu/hc/en-us/articles/4415084375954

@NSIT
Please let me know the ticket number via PM if have any issues with our support, we are daily reachable and also update support tickets daily, usually, we can fix issues on the same day or in very fewer days.

Thanks!

nexotelecom

Hello! I had same issue with VPN300 and Windows 10 devices. Microsoft has released a patch to solve the problem. I have just installed it and now the L2TP windows cliente is able to connect again without errors. You can manually download the patch here = KB5010793. This was the patch Tuesday causing the L2TP connection issue. Be sure to chech which Windows version you are running. Hope it helps! kind regards