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VPN L2TP issue with Windows 10

thomas chevalier

I would like to get some help.

I am trying to create a L2TP VPN for a remote user.      

So far, i have done the VPN configuration, and Firewall rules (to be able to acces to my internal network)

 

Until now, i am only able to connect to the VPN with my IPhone. (and i can access to my network without trouble)

But when i try to connect to the VPN with my laptop, i always have an error message : the L2TP connection attempt failed because the security layer encountered a processing error during the initial negotiations with the remote computer.

 

For the VPN configuration, I am using the “DefaultL2TP” Policy

I do the authentification with a preshared Key

For the test, I have disable the firewall of my laptop.

 

Have you an idea about how can I make it works with my laptop?

I am trying too to connect the VPN on my laptop as using my IPhone as router, but i have the same error message.

 

Thanks for your answer ,

 

Best regards,



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  • 0

    Hi Thomas,

    The error message: "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer" is a generic error to identify when the IPSec negotiation fails for L2TP/IPSec connections.

    Which authentication method is selected on your Windows VPN Settings (PAP, CHAP, MS-CHAPv2)?

    Try playing around with the authentication methods to see if one works over another for your laptop and please update me with your findings. 

    Thanks,
    Karlos

  • 0 in reply to Karlos

    Hi Karlos,

     

    Thanks for your answer.

     

    So far, i was trying to connect with the MS-CHAPV2.

    This morning i was trying the CHAP and then the PAP authetification method.

    But i still have the same result.

    I even don't have any log on my router.

     

    Yesterday evening, i have also tried with a personal laptop that is in Windows 7. (it couldn't connect either) (i was home with a personal WIFI, Firewall OFF )

     

    I am still able to connect with my Iphone (with the DATA or WIFI)

    This is the log from my IPhone on the Router :

     

    Thanks for your help,

     

    Best regards,

Reply
  • 0 in reply to Karlos

    Hi Karlos,

     

    Thanks for your answer.

     

    So far, i was trying to connect with the MS-CHAPV2.

    This morning i was trying the CHAP and then the PAP authetification method.

    But i still have the same result.

    I even don't have any log on my router.

     

    Yesterday evening, i have also tried with a personal laptop that is in Windows 7. (it couldn't connect either) (i was home with a personal WIFI, Firewall OFF )

     

    I am still able to connect with my Iphone (with the DATA or WIFI)

    This is the log from my IPhone on the Router :

     

    Thanks for your help,

     

    Best regards,

Children
  • 0 in reply to thomas chevalier

    Hi Markos,

     

    I have figure out why it doesn't work.

    It was something i have never expected, on all my windows 10 laptop, the services "IKE key generation module and AuthIP" and "IPSEC policy agent" were disable .

    I could connect by VPN my laptop.

     

    I am going to do more test tomorrow .

     

    Thanks,

     

    Best regards,