Re-enable IPSec According to reports, the VPN error 789 can happen on your Windows 7/8/10/11 PC if you disable essential services for self-hosted VPNs. To fix the error, re-enable them.
In some cases, the apparition of the ‘ VPN Remote Access Error 789? error is linked with a network inconsistency caused by a network adapter that got stuck in a limbo state. This scenario will make it impossible for the VPN config to get the necessary data to establish a connection.Updated December 2023: Stop error messages and fix your computer problem with this tool. Get it now at this link
If your system is not set up properly to connect to an L2TP server, you will get a dial-up error 789, so the connection attempt will not even happen before you connect to the server. In this case, it is always due to a misconfiguration of your individual Windows operating system such as Windows 10.
Method 1: Uninstall the latest security update
Method 2: Enable the Microsoft CHAP v2 protocol.
Round 3 method: on these special extensions to the LCP protocol.
Method 4: By restarting the IPSec service.
Method 5: Reinstall via someone else’s network card.
“The L2TP connection attempt failed because the security layer encountered a run-time error during initial negotiations with the remote computer.” “The L2TP connection attempt failed because security addressing encountered a processing error during the initial negotiation with the remote repair computer.”
Make sure the necessary L2TP/IPsec ports are enabled on the VPN server side.
Connect to another VPN due to device or network.
Delete and create a VPN connection.
Quite often, Internet users encounter various problems when trying to use this secure connection in the first place, and no matter what operating system you are using, there is a high chance of encountering several vpn error codes. Today finding an error in VPN Error 789.
Fixed: Error 800 Windows 7 (L2TP client much larger than IP Sec cannot connect)
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