GET /exchange/ - 80 - xxx.xxx.x.x Mozilla/4.0 401 2 2148074254. (The x's are replacing an IP address.)
Are these lines normal, or is that someone trying to hack into our system?
The log format is based off of the W3C's extended log file format. For troubleshooting purposes, it is possible to have additional information logged.
In the following example, notice that, in addition to what you are logging, there is also a domain and username being logged:
2005-08-05 00:25:05 192.168.1.11 GKrich.luckett 192.168.1.250 80 GET /exchange - 404 Mozilla/4.0+(compatible;+MSIE+5.01;+Windows+NT+5.0;+DigExt)
Learn more about the format here.
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This was first published in December 2005