If you have IIS6, and you aren't sure if it is configured or not, then it likely isn't. IIS6 needs a third-party utility manually configured for X-Forwarded-For.
Refer to the first link for IIS6.
pramod1
ASKER
when I open iis I see iis7 but i see logging not advanced logging
Paul Wagner
OK, if you have IIS7 and no advanced logging, then X-Forwarded-For is not configured. If you want it configured, you can follow the article links I provided for setting it up. Good luck!