However, quite recently, a lot of reports have been coming in where users are unable to make a VPN connection and a “The L2TP connection attempt failed because the security layer encountered a processing error during the initial negotiations with the remote computer” Error is returned while trying to do so. In this article, we will discuss the reasons due to which it is triggered and also provide viable solutions to fix it completely.
What Causes the “L2TP Connection Attempt Failed” Error?
After receiving numerous reports from multiple users, we decided to investigate the issue and devised a set of solutions to fix it completely. Also, we looked into the reasons due to which it is triggered and listed them as follows. Now that you have a basic understanding of the nature of the problem, we will move on towards the solutions. Make sure to implement these in the specific order in which they are presented to avoid conflicts.
Solution 1: Enabling MS-CHAP v2
Since it is important that the Microsoft CHAP v2 protocol is enabled before trying to connect to a VPN in Windows 10, in this step, we will be enabling the protocol. For that:
Solution 2: Enabling LCP Extensions
It is also important that the PPP Settings are configured to allow LCP Extensions, therefore, in this step, we will be changing the VPN properties and enabling the extensions. For that:
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