19 Oct 2013 If you receive this error on Windows 10 (or Windows 8.1) while trying to connect with the Cisco VPN Client then the solution is a simple registry 

Nous vous recommandons: Le programme pour la correction des erreurs, optimiser et d'accélérer Windows. Si vous utilisez un réseau privé virtuel (VPN) et que vous êtes averti par l' erreur 789 de Windows 10 VPN, procédez comme suit: « La tentative de connexion L2TP a échoué car la couche de sécurité a rencontré une erreur de traitement lors des négociations initiales avec l VPN connection failed with error 789 because of poor L2TP client settings in Windows 10. Learn how to fix this from our guide. Ankit Gupta is a writer by profession and has more than 7 years of global writing experience on technology and other areas. He follows technological developments and likes to write about Windows In general, if the user encounters the VPN connection error 789 with an L2TP based VPN client that is behind NAT or frequent disconnects and failed connection attempts, that means the VPN client that you’re using has not configured to run behind a NAT service by default. Then you will not get a stable connection. So if you wish to make it work, then you will have to build the AssumeUDPEncapsulationContextOnSendRule registry key. To create that registry value, you have to follow the below Machine Certificate on VPN Server does not have 'Server Authentication' as the EKU Make sure correct certificate is used both on client and server side. In case Pre Shared Key (PSK) is used, make sure the same PSK is configured on the client and the VPN server machine. To apply this hotfix, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows Server 2012 R2. Registry information After you install this hotfix, the following registry subkey is configured: If you are ever prompted with L2TP Error 789, it might be due to the fact that your system is not perfectly set up to get connected to an L2TP server. The connection attempt fails even before a connection is established with the server. VPN Error 789 is linked with incorrect configuration of user’s operating system.

Awesome find @palmtree!Good to know I will keep that solution in mind, I've definitely run across that issue before. I figured you were talking about the dreaded 789 when I read your post, that one is definitely a pain haha.

17 Sep 2019 I have setup SSL VPN and can connect with AnyConnect but we would prefer to use the built-in Windows (7 and 10) VPN functionality. Regarding the error 789, it seems some settings on the operating system side is not 

7 Jul 2019 “The Remote Access Connection Manager (RASMAN) service may stop working and you may receive the error '0xc0000005',” Microsoft warns 

Salut à tous, une question pour les pro du réseau: Je possède un abonnement au VPN IPVanish et j'en suis très content, mais j'ai un problème avec le protocole L2TP/IPSec qui me renvoie une erreur 789 à chaque fois que je veux me connecter sur n'importe lequel de leurs serveurs, seulement sous mon PC Windows 8.1 x64 car sur le même réseau, mon iPhone/iPad et Mac OSX se connectent sans 11/05/2020 Awesome find @palmtree!Good to know I will keep that solution in mind, I've definitely run across that issue before. I figured you were talking about the dreaded 789 when I read your post, that one is definitely a … 26/04/2018 Wenn Sie ein VPN verwenden und mit dem Windows 10 VPN-Fehler 789 aufgefordert werden: Der L2TP-Verbindungsversuch ist fehlgeschlagen, weil die Sicherheitsschicht bei den ersten Verhandlungen mit dem entfernten Computer auf einen Verarbeitungsfehler gestoßen ist. Dieser Fehler tritt auf, wenn Ihr System nicht ordnungsgemäß für die Verbindung zu einem L2TP-Server eingerichtet ist, so dass