"Can't connect to VPN. The L2TP connection attempt failed..." with Built-In VPN Client on Windows 10

"Can't connect to VPN. The L2TP connection attempt failed..." with Built-In VPN Client on Windows 10
"Can't connect to VPN. The L2TP connection attempt failed..." with Built-In VPN Client on Windows 10
2022-01-20 04:21:03 - last edited Sunday

This Article Applies to: 

 

All the TP-Link VPN Routers, including ER605 and ER7206.

 

Issue Description/Phenomenon:

 

We received feedback that after a recent Windows 10 update (KB5009543), using the built-in VPN client cannot connect to ER605/ER7206 via L2TP over IPsec VPN anymore, the error message indicates “Can’t connect to VPN. The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.” like the image below. While the same L2TP VPN setup works just fine on Mac, which seems to be the Windows issue.

 

 

Available Solutions:

 

Microsoft confirmed the issue and offered the resolution in the following link:

https://docs.microsoft.com/en-us/windows/release-health/status-windows-10-21h2#2773msgdesc

 

So this issue was resolved in the out-of-band update KB5010793 (https://support.microsoft.com/help/5010793) released on January 17, 2022.

 

If you suffer from this issue, please refer to the link above to install the update for the fix.

 

 

Thank you for your attention!

 

Feedback:
 

If this was helpful, welcome to give us Kudos by clicking the thumbs-up button below.

 

If the solution doesn't work for you, your case is probably different from what is described here.

In that case, please feel free to click Start a New Thread and elaborate on the problem so that we can try to help you further.

 

Thank you for your great cooperation and patience!

TP-Link Support Team

New to the TP-Link Community? Getting Started from this thread: https://community.tp-link.com/en/business/forum/topic/551684
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