Don't worry. Life's too long. -- Vincent Sardi, Jr.
OS Fingerprint: An error occured in the p0f script; please tell me about this
This is done through passive OS fingerprinting based on the first SYN packet. This is not as accurate as an active scan, but it will usually get at least the OS family correct.
You are using http via IPv4, from 38.103.63.60 (which does not have reverse DNS).
I am guessing you are using bot with URL http://www.commoncrawl.org/bot.html). Here's the headers it gave me:
This server has been up for 87 days, 7:17 and the load average for the past 1, 5, and 15 minutes is 0.00, 0.00, 0.00.
Last modified Thu May 3 21:11:46 2007. ©2005-2007 Daniel De Graaf