Follow the steps below to add X-Forwarded-For column into IIS 8.5 logs:
- Open IIS Manager
- On server, site or application level, double click Logging
- Click Select Fields
- In W3C Logging Fields window, click Add Field
- In the Add Custom Field window, fill out the following fields:
1.Field Name : X-Forwarded-For, Source type : Request Header, Source : X-Forwarded-For - Click OK in both open windows.
- Click Apply in the actions pane.
Wait for a new log file to be created in the logs folder. Column changes will be effective when a new log file is created.
Command Line
%systemroot%\system32\inetsrv\APPCMD.EXE set config -section:system.applicationHost/sites /+"[name='Default Web Site'].logFile.customFields.[logFieldName='X-Forwarded-For',sourceName='X-Forwarded-For',sourceType='RequestHeader']" /commit:apphost