The L2tp Connection Attempt Failed Because the Security Layer Encountered a Processing Error

the L2TP connection attempt failed because the security layer encountered a processing error

If you’re running L2TP-based VPN clients and you just rolled out KB5009543, chances are you’ve got users lightening up your helpdesk today!

On January the 11th, 2022, Microsoft dumped a patch that unfortunately has the potential to break your L2TP clients.

Read more about this hotfix here.

Until Microsoft solves this issue and provides another update, you have no other option than to remove the hotfix from your clients.

You can use the following PowerShell script as inspiration if you want to script your way out of this mess:

$KB = "19041.1466.1.6"
$CmdOutput = "Update " + $KB + " not found."
$SearchUpdates = dism /online /get-packages | findstr "Package_for" | findstr "$KB"
if ($SearchUpdates) {
    $update = $SearchUpdates.split(":")[1].replace(" ", "")
    $CmdOutput = dism /Online /Remove-Package /PackageName:$update /quiet /norestart
Write-Output $CmdOutput

The script is inspired by information found here and here.

The script has not been tested in-depth, so make sure you test it properly before rolling it out on a large scale!

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