VPN L2TP and Windows Client

Albymatta
Albymatta Posts: 10
Hello at all,
I have a problem with a L2TP VPN configured on Nebula.
I have a Firewall NSG100 and i have already configured a VPN L2TP and connection client side with the Windows native VPN. All of this worked since yesterday well.

Yesterday i have done a little modify, i have power on the IPSec VPN Server and configure that. After i have poweroff and save the configuration, and now, my L2TP over IPSec VPN server doesn't work already. With nebula the configuration is very simply, i can't change a lot of settings.

Thinks that i have already checked:
- I have the nebula cloud authentication login method i have tried to change the password and set again on Windows VPN but nothing;
- The public IP address of firewall is ok;
- i have checked the secret key and re-write that both server side and client side (no special character)
- i have already deactivate the Windows Update that seems blocking L2TP VPN Connection
- I have a Nebula Cloud Base Pack ( maybe is this the problem?)

This is an image server side (i have checked that the user of Nebula Cloud Authentication is already VPN authorized and since yesterday works fine):

Side Windows:



The Log on nebula 


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All Replies

  • Zyxel_Melen
    Zyxel_Melen Posts: 269  Zyxel Employee
    Hi @Albymatta,

    In order to clarify your symptom, were there any error messages pop out on Windows?

    By the way, may you help to enable Zyxel support so I can help to check?
    Please also provide your organization name so I can find your organization.


    Melen
  • mMontana
    mMontana Posts: 731  Guru Member
    edited July 4
    Yesterday i have done a little modify, i have power on the IPSec VPN Server and configure that. After i have poweroff and save the configuration

    Would you please kindly elaborate a bit more on what is IPSec VPN Server (at least as device) and, generally speaking, what have you done?
    Don't forget that L2TP is for tunneling of the client, but the encryption phase is IPSec.
  • Albymatta
    Albymatta Posts: 10
    @Zyxel_Melen
    Thanks for reply, i have enable the function in Nebula. So, the error on Windows is:

    I am not under firewall because for trying i used a Mobile Hotspot, for exclude firewall side problem.

    @mMontana

    I have enable this on Nebula Cloud, for trying SecurExtender client:

    But after trying i have disable like the image that you view.

    -Don't forget that L2TP is for tunneling of the client, but the encryption phase is IPSec.

    Yes i know this but i cannot understand the error because i haven't change nothing in my configuration, only the IPSec VPN Server for a few minutes.
  • mMontana
    mMontana Posts: 731  Guru Member
    edited July 4
    @Albymatta did you already explained to Windows (via registry) that both endpoints are behind a NAT?
  • Zyxel_Melen
    Zyxel_Melen Posts: 269  Zyxel Employee
    Hi @Albymattam,

    If you aren't sure what @mMontana said, you may reference this discussion to check the  L2TP/IPsec server behind NAT-T device configuration on Windows.


    Melen
  • Albymatta
    Albymatta Posts: 10
    Hi @Zyxel_Melen and @mMontana
     
    i have already set this registry key in regedit.exe, without success
  • Albymatta
    Albymatta Posts: 10
    @Zyxel_Melen
    I have tried also with Android phone and i have the same issue... seems that is a firewall side problem
  • Zyxel_Melen
    Zyxel_Melen Posts: 269  Zyxel Employee
    Hi @Albymatta,

    May you help to enable Zyxel support so I can help to check the running configuration of your NSG?
    Please also provide your organization name so I can find your organization.
    Melen
  • Albymatta
    Albymatta Posts: 10
    Hi @Zyxel_Melen
     i have already enabled Support. I can send MP with my organization name?
  • Zyxel_Melen
    Zyxel_Melen Posts: 269  Zyxel Employee
    Hi @Albymatta

    Sure. You can send the org name by PM.
    Melen

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