Setup guide

Troubleshooting

Description

• I use firewall and I cannot establish L2TP connection

Make sure UDP connections can pass through both directions between your sites.

• My Windows L2TP/IPsec VPN Client fails to connect to L2TP server with "Error 789"

or "Error 781"

The error messages 789 and 781 occur when IPsec is not configured properly on both ends.

See the respective documentation on how to configure IPsec in the Microsoft L2TP/IPsec VPN

Client and in the Wandy RouterOS. If you do not want to use IPsec, it can be easily

switched off on the client side. Note: if you are using Windows 2000, you need to edit system

registry using regedt32.exe or regedit.exe. Add the following registry value to

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\Parameters:

Value Name: ProhibitIpSec

Data Type: REG_DWORD

Value: 1

You must restart the Windows 2000 for the changes to take effect

For more information on configuring Windows 2000, see:

• Configuring Cisco IOS and Windows 2000 Clients for L2TP Using Microsoft IAS

• Disabling IPSEC Policy Used with L2TP

• How to Configure a L2TP/IPsec Connection Using Pre-shared Key Authentication

CISCO/Aironet 2.4GHz 11Mbps Wireless Interface

Document revision 1.1 (Fri Mar 05 08:12:41 GMT 2004)

This document applies to Wandy RouterOS V2.8

Table of Contents

Summary

Specifications