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Barracuda Web Application Firewall

How do I log actual client IP address in the IIS 5 and IIS 6 logs when using a Barracuda Web Application Firewall?

  • Type: Knowledgebase
  • Date changed: 9 years ago

Solution #00004611



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 server.  By default, the Web Application Firewall forwards the client IP address as the header X-Forwarded-For.

  1. Extract the X-Forwarded-For.dll file into a folder on the Web Server.
  2. Open Internet Services Manager and go to the Properties section of the Website.
  3. In the ISAPI filter tab, add the X-Forwarded-For.dll file.
  4. Restart the WWW service from Administrative Tools > Services.


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