• 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 MikroTik 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
Page 333 of 695
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Other trademarks and registred trademarks mentioned herein are properties of their respective owners.
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