Figure 1: Sample IIS log data for an authentication attempt

#Software: Microsoft Internet Information Services 5.1
#Version: 1.0
#Date: 2002-11-12 18:18:29
#Fields: time c-ip cs-username cs-method cs-uri-stem sc-status
15:52:37 66.169.82.5 jsmith GET /Default.htm 200
18:18:33 66.169.40.16 bjones GET /Default.htm 401