[MX64] The L2TP connection attempt failed because the security layer encountered a processing error

SOLVED
BFrança
Here to help

[MX64] The L2TP connection attempt failed because the security layer encountered a processing error

Hey guys.

I'm having difficulties connecting to a client-to-site VPN on some firewalls. This, specifically, is the MX64 but I'm also having the same problem on the MX84, however, this one I managed to get around the problem using VPN Client AnyConnect. When trying to connect to the VPN the message "The L2TP connection attempt failed because the security layer encountered a processing error" is displayed. I've already tested all the procedures I found available on the internet and nothing worked so I appealed to you hahaha.

 

Could someone who has faced this problem help me?

 

Thanks in advance for everyone's attention.

1 ACCEPTED SOLUTION
BrandonS
Kind of a big deal

I assume you are using Windows and missed this thread 😉

 

https://community.meraki.com/t5/Security-SD-WAN/Client-VPN-Error-After-January-Windows-Updates/m-p/1...

 

Short answer, you need to remove a recent Windows update.

View solution in original post

3 REPLIES 3
BrandonS
Kind of a big deal

I assume you are using Windows and missed this thread 😉

 

https://community.meraki.com/t5/Security-SD-WAN/Client-VPN-Error-After-January-Windows-Updates/m-p/1...

 

Short answer, you need to remove a recent Windows update.

View solution in original post

THANK YOU! I was going insane, I have 20+ MX at different customers, made the mistake to not test VPN prior to installing since have never had an issue.

 

Was on hold waiting for support, removed the update, recreated the VPN, not thinking would work, and by my shock it did. 

 

Craziest thing is, I have an MX80 and Z1 that i was testing with, they never stopped working, this was a Z3. 

 

Signed up for meraki community to post this, thanks again.

BFrança
Here to help

Thank you Brandon! It really helped.

Get notified when there are additional replies to this discussion.
Welcome to the Meraki Community!
To start contributing, simply sign in with your Cisco account. If you don't yet have a Cisco account, you can sign up.
Labels