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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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What Are the Possible Causes of L2TP Dialup Failure on a PC?

What Are the Possible Causes of L2TP Dialup Failure on a PC?

Possible Causes

PCs may run the Windows XP, Windows 7, Windows 8, or Windows 10 operating systems.

The failure to set up an L2TP tunnel between a device and a PC running Windows XP, Windows 7, or Windows 8 may be caused by the failure to modify the system registry. Windows 10 does not require modification of the system registry.

Troubleshooting Procedure

This section describes the procedure for modifying the system registry of Windows 7 so the function for using a digital certificate for authentication is disabled. The modification procedures for Windows XP and Windows 8 are similar.


The method of modifying the system registry for the 64-bit Windows 7 operating system is the same as that for 32-bit Windows 7.

  1. Choose Start > cmd and enter regedit to open the registry.
  2. Choose HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\RasMan\Parameters in the left, right-click a blank area in the right, and choose New > DWORD (32–bit) Value to generate the New Value #1 file.
  3. Right-click New Value #1 and choose Rename to rename the file as ProhibitIpSec.
  4. Right-click the ProhibitIpSec file and choose Modify.
  5. In the displayed Edit DWORD (32-bit) Value dialog box, set Value data to 1 and select Hexadecimal under Base, as shown in Figure 29-33.
  6. Restart the PC to make the configuration take effect.
Figure 29-33 Registry editor

Updated: 2019-08-09

Document ID: EDOC1000079719

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