L2TP connection failed on meraki

Posted by NSFW_IT_Account@reddit | sysadmin | View on Reddit | 4 comments

All of a sudden, I am getting the following error when attempting to connect to meraki vpn: “the L2TP connection failed because the security layer encountered a processing error during initial negotiation with remote computer” Multiple users reporting it and we tried getting them off their home wifi onto hotspot and still persisted. I was able to replicate on my own device and fix it by uninstall and reinstalling the WAN miniports in device manager. I am wondering what would cause this on multiple computers. A meraki or windows update perhaps? Any way to fix it server side or will i have to replicate the fix on all computers with the issue? Tia

4 Comments

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Different_Pain5781@reddit

I’ve seen this happen after certain Windows cumulative updates. Never on all machines, just a weird scatter. Usually goes away after reinstalling WAN miniports or resetting winsock.

Icy_Employment5619@reddit

yeah, had this on a couple of devices, this fixed it for me, but not encountered the issue in like a year.

alyssa_at_chronicle@reddit

Agree with u/Different_Pain5781 \- it's likely tied to a recent Windows update rather than anything Meraki-side. The L2TP stack on Windows can get corrupted and causes exactly that negotiation error. Reinstalling the WAN Miniports is the correct fix, but unfortunately there’s no Meraki/server-side change that resolves it. Until Microsoft patches it, you’ll probably need to apply the miniport reinstall on affected machines or script it for scale.

bestdriverinvancity@reddit

In my experience I get that occasionally after an update enables chapv2 and unchecks PAP in the vpn settings on a windows client.

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4 Comments