Can't connect more users in L2TP/IPsec

[Damo112]

Hi everyone,
I have a problem with my L2TP VPN, I have previously connected a Windows 10 client that connects to the VPN without any problem, but when I want to connect another client that does not want, it displays the error 789 of Windows. The one that manages to connect even when I disconnect it and it reconnects without problem, but not the other one, would you have a solution to help me please?

I forgot to specify that, I'm a beginner and this is the first time I have to create a VPN under L2TP/IPsec

Thank you in advance for your answer =).

[Damo112]

hey please help me

[viktor_g]

This is a Windows issue, see https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-l2tp-ipsec-server-behind-nat-t-device

[Damo112]

@viktor_g
Hello,
first of all thank you for your answer.
I have already completed the steps on the link you sent me.
But it hasn't changed anything and the error persists.

[Damo112]

This post is deleted!

[Damo112]

Okay,
I think i have found the problem, in the IPsec > Pre-shared keys,
it's possible that the key you entered is blocking the connection of other workstations.
In any case this was the cause of my problem.

I share this solution if people have the same problem as me.

Bye ! =)