fooling netcraft about OS info.  HOW?

Posted on 2003-03-04
Medium Priority
Last Modified: 2006-11-17
The site mentions a few sites that intentionally send out misleading data about which OS its running.  How is this done?
Question by:gord11
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Accepted Solution

PaschalNee earned 80 total points
ID: 8064136
Most web servers respond with some info on the type of server they are running.  Below is a sample trace.  You'' See the "Server:" header indicates the server type and OS.

$ telnet server.company.com 80
Connected to server.company.com.
Escape character is '^]'.

HTTP/1.1 200 OK
Date: Tue, 04 Mar 2003 13:26:41 GMT
Server: Apache/1.3.12 (Unix) PHP/3.0.16
Last-Modified: Wed, 19 Feb 2003 17:37:19 GMT
ETag: "2cb663f-146a-3e53c0cf"
Accept-Ranges: bytes
Content-Length: 5226
Connection: close
Content-Type: text/html

Connection closed by foreign host.

On most Web servers you can configure what (if anything) gets sent back to the browser in the "Server:" tag.

Docs to do this for Apache are here

NetCraft can also guess the OS by looking at the raw TCP/IP data.  Each OS produces a slightly different TCP/IP format although they all conform to the spec.  By looking the the raw TCP/IP profile and comparing it to the profile of known OS's you can guess the OS.  This too can get a bit messed up as proxy servers between the user and the server will put their own TCP/IP profile on the data.

Lots of detail on the NetCraft site

Author Comment

ID: 8064580
hmmm...that was quick.   Thank you very much..

Featured Post

Want to be a Web Developer? Get Certified Today!

Enroll in the Certified Web Development Professional course package to learn HTML, Javascript, and PHP. Build a solid foundation to work toward your dream job!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction How to create multiboot configuration with XP\Vista and Windows 7 on it? And most important question - how to do this correctly so not to have any kind of nightmares we get when system gets screwed? First of all one should realize t…
I. Introduction There's an interesting discussion going on now in an Experts Exchange Group — Attachments with no extension (http://www.experts-exchange.com/discussions/210281/Attachments-with-no-extension.html). This reminded me of questions tha…
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…
Hi friends,  in this video  I'll show you how new windows 10 user can learn the using of windows 10. Thank you.

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question