W3C Extended Logs (the default for IIS)
The W3C Extended Log Format includes formatting information into the file, so SmarterStats can handle many variations of the logs.
More Information:
https://www.w3.org/TR/WD-logfile-960221.html
Required Fields for Proper Importing:
SmarterTools Knowledge Base - Determine Which Log Files are Necessary to Check in IIS
Common Log Format (CLF)
The Common Log Format is an Apache logging format that includes most basic information about traffic to a website. Due to missing referral and user agent information, however, some reports in SmarterStats may show up empty if you use this format. If possible, it is recommended to use NCSA Extended or W3C Extended logs.
Definition String in Apache
"%h %l %u %t \"%r\" %>s %b"
Fields
clientIP - RemoteLoginName - Username - [d/MMM/yyyy:HH:mm:ss zz00] - "Method URL ProtocolAndVersion" - ProtocolStatus - Bytes
Example
10.1.1.1 - - [5/Dec/2007:19:00:00 -0500] "GET /Default.htm HTTP/1.1" 200 2857
NCSA Extended/Combined Log Format
Definition String in Apache
"%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\""Fields
ClientIP - logname(unused) - UserName - LogTime - "(Method UriStem)/(UriQuery) - ProtocolVersion" - ProtocolStatus - BytesSent - "Referrer" - "UserAgent”
Example
10.1.1.1 - - [5/Dec/2007:19:00:00 -0500] "GET /Default.htm HTTP/1.1" 200 2857 "http://www.google.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322)"
IIS Log Format
For more Information please refer to:
https://docs.microsoft.com/en-us/previous-versions/iis/6.0-sdk/ms525807(v=vs.90)
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