Other potential causes include incorrect VPN settings, like wrong pre-shared keys, or network issues blocking the UDP ports needed for VPN traffic. Now that you understand the problem, let us move on to the solutions. Follow these steps in order to avoid conflicts.
1. Enable MS-CHAP v2
Switching to MS-CHAP v2 is important because it updates the VPN’s login process. MS-CHAP v2 is a safer version of an older security method. It makes the connection more secure by letting both the client and server confirm each other’s identity. This helps prevent security issues that could stop the connection.
2. Enabling LCP Extensions
Changing the Link Control Protocol (LCP) settings, especially turning on LCP extensions, can help fix VPN connection problems like the L2TP error. These extensions make the connection setup between your computer and the VPN server more advanced and flexible. They offer better error detection and network setup options, which help the VPN connect more reliably. Enabling these extensions can solve the connection issues that stop the L2TP tunnel from working properly.
