Can’t connecto to vpn. The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer

After recent Windows 10 update, you may get this error while trying to connect through Windows 10 in-built VPN client.

Can’t connecto to vpn. The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

The easiest fix is to uninstall the latest windows security update. Open Control Panel -> Programs and Features. Click on “view installed updates” link –

And you should see a Windows security update KB5009543. Uninstall this update. It may require a windows reboot.

To stop Windows from installing this update again, you can turn updates off till the time Windows pushes another update to fix this problem.