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Barracuda Web Application Firewall

How can I log the actual client IP address in IIS7 or Windows Server 2008 when using a Barracuda Web Application Firewall?

  • Type: Knowledgebase
  • Date changed: 2 years ago

Solution #00004607



Applies to all Barracuda Web Application Firewalls.



To log the actual client IP instead of the VIP of the Barracuda Web Application Firewall in the IIS logs, install the x-forwarded-for DLL on the IIS 7server. By default, the WAF forwards the clients IP address as the header X-Forwarded-For:


  1. Open IIS Manager and navigate to the level you want to manage.
  2. In Features View, on the server or site Home page, double-click ISAPI Filters.
  3. Add the X-Forwarded-For dll file from the file. Make sure you choose the correct processor.
  4. Restart the WWW services on the IIS server.


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