(2012-01-26) Troubleshooting Authentication Problems – Kerberos Or NTLM

Over the years I have written a few blog posts about or related to Kerberos or NTLM authentication. These blog posts are summarized here for your convenience:

• (2006-12-28) NTLM And Kerberos Authentication Explained The Easy Way
• (2010-10-12) User Principal Names In AD (Part 1)
• (2010-10-12) User Principal Names In AD (Part 2)
• (2010-10-12) User Principal Names In AD (Part 3)
• (2011-02-13) Accessing A Resource With The Kerberos Authentication Protocol
• (2011-02-13 ) Accessing A Resource With The NTLM Authentication Protocol
• (2011-02-13) When Will The Password Expire For An AD User Account And What Happens Then?

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However, in addition to what I have written, the guys at AskDS have written a bunch of excellent Kerberos related blog posts. These blog posts are summarized here for your convenience:

• Kerberos for the Busy Admin
• Troubleshooting Kerberos Authentication problems – Name resolution issues
• Kerberos Authentication problems – Service Principal Name (SPN) issues – Part 1
• Kerberos Authentication problems – Service Principal Name (SPN) issues – Part 2
• Kerberos Authentication problems – Service Principal Name (SPN) issues – Part 3
• Understanding Kerberos Double Hop
• Fun with the Kerberos Delegation Web Site

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A guy from WebTopics also has written a very good blog post about Kerberos in IIS. This blog post is also here for your convenience:

• Service Principal Name (SPN) checklist for Kerberos authentication with IIS 7.0/7.5

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And the guys from IIS support in France have also written a great article about troubleshooting Kerberos

• Things to check when Kerberos authentication fails using IIS/IE

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Read all these blog posts, and you are up to speed in no time when the need arises to troubleshoot authentication problems. Have fun!

Cheers,
Jorge
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