update of http://www.grolmsnet.de/kerbtut/

Hello,

I've done some minor changes to 
"Using mod_auth_kerb and Windows 2000/2003 as KDC"
at <http://www.grolmsnet.de/kerbtut/>.

Please let me know if the explanations need corrections
(maybe they are wrong, incomplete, incomprehensible).

#--------------------------------------------------------------------------------

1. Firefox configuration

added short HOWTO "using negotiate authentication (GSSAPI Kerberos) with 
Firefox". at 

<http://www.grolmsnet.de/kerbtut/firefox.html>

This describes how to activate Negotiate Authentication in Firefox Webbrowser.
(I was asked many times by people who don't know how to do this).
#--------------------------------------------------------------------------------

2. DNS hostnames

Added explanation what hostname to use in ktpass command:

"use the canonical hostname  of beren.grolmsnet.de in ktpass command. 
 That means

 * if beren.grolmsnet.de is a CNAME-record use the DNS-name the CNAME record 
points to.

 * if beren.grolmsnet.de is an A-record ensure the corresponding PTR record 
points to beren.grolmsnet.de, too.
(In other words: reverse-DNS-lookup of beren.grolmsnet.de's IP address has to 
point to beren.grolmsnet.de)"

(I met a lot of strange DNS configurations during last weeks...)
#--------------------------------------------------------------------------------


Please let me know if the explanations need corrections
(maybe they are wrong, incomplete, incomprehensible).



Thank you,
Achim


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