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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 Can I Do If a PC Running the Windows 7 or XP Operating System Fails to Establish an L2TP over IPSec Tunnel with the Device?

What Can I Do If a PC Running the Windows 7 or XP Operating System Fails to Establish an L2TP over IPSec Tunnel with the Device?

The possible cause for an L2TP over IPSec tunnel establishment failure between a PC running the Windows 7 or XP operating system and the device is that the system registry is not modified.

The following describes how to modify the registry of the Windows 7 operating system so as not to use digital certificate authentication.


The operations in the 64-bit Windows 7 operating system are the same as those in the 32-bit operating system.

  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 29-35.
  6. Restart the PC to make the configuration take effect.
Figure 29-35  Registry Editor

Updated: 2019-05-10

Document ID: EDOC1000079719

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