Why does VPN error 789 appear? This error pops up when your system is not properly set up to connect to an L2TP server, thus the connection attempt fails even before you establish a connection with the server. It is also linked to the incorrect configuration of your operating system like Windows 10 in this case.
How do I fix Error 789?
Restart the VPN network adapter.
Check the certificate.
Re-enable the IPsec service.
How do I fix the L2TP connection attempt failed because of security?
Press “Windows” + “R” to access the open “Run” prompt.
Enter “ncpa.
Right-click when adding a “VPN” connection and select “Properties”.
Click on the “Options” theme and select the “DPI Settings” tab.
Select the Enable LCP Parameter Extensions check box and click OK.
Can’t connect to VPN after Windows 10 update?
Factory settings for your PC
If you’re still unable to use a VPN on Windows 10 after upgrading, be sure to submit a request to Microsoft and your VPN provider. Also, if you have problems with the corporate network system, contact your network administrator.
What does it mean when the L2TP connection failed?
The “L2TP connection attempt failed because the security layer encountered a processing error” error can also occur mainly due to two different reasons. Either Microsoft CHAP v2 is disabled or the PPP settings are not configured correctly on the Windows PC.
Which has failed the error code returned on failure is 789?
VPN error 789 is one of the most common errors that occurs when a user tries to restore L2TP. … Your current VPN server or client has the wrong set of certificates in addition to the pre-shared key. The certificate node certificate or the trusted root computer certificate simply does not exist on the VPN server.
Has failed the error code returned on failure is 789?
VPN error 789 was one of the most common obstacles when a user tried to connect to L2TP. … The VPN server or yours has an invalid certificate or an invalid preshared key. The machine certificate or trusted root recipient certificate is not present on the corresponding VPN server.
Charles Howell is a freelance writer and editor. He has been writing about consumer electronics, how-to guides, and the latest news in the tech world for over 10 years. His work has been featured on a variety of websites, including techcrunch.com, where he is a contributor. When he’s not writing or spending time with his family, he enjoys playing tennis and exploring new restaurants in the area.