Newbie question about NTLM and web sites

Posted by kipp b on August 12, 2004, 9:17 am

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Sorry about the simplicity of this question:

I noticed within a lot of web sites there is an NTLM authentication
when a user does a simple HTTP GET.

Example:

http://www.amazon.com/exec/obidos/subst/home/home.html

GET http://www.amazon.com/exec/obidos/subst/home/home.html HTTP/1.1
Host: www.amazon.com:80
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7)
Gecko/20040803 Firefox/0.9.3
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Cookie: session-id=104-4473924-0563158; ubid-main=430-7321142-9950765;
session-id-time=1092816000
Proxy-Authorization: NTLM TlRMTVNTUAABAAAAB4IIAAAAAAAAAAAAAAAAAAAAAAA=

Question .... why does a user who has no login account need to
authenticate? What is the thought process behind this?

Thanks in advance

Posted by Patrice Auffret on August 13, 2004, 9:55 am

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On 12 Aug 2004 08:17:24 -0700
kipp_groups@yahoo.com (kipp b) wrote:

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I think your are accessing those 'NTLM authentication required'
web sites via a proxy, probably implemented somewhere in your
network.

And it is this proxy that require NTLM authentication.