Kerberos authentication and use the KTPASS tool

I work in support to a network analysis software company.  We have the ability to use Kerberos authentication for our product.  Recently, we found that when you generate the keytab file using ktpass on a Windows Server 2003 or 2008, it is a step backwards in the process.  Eventually do you run the ktpass twice to get the keytab file good.

Our external authentication module is software that uses Kerberos authentication and then he puts it on a remote client computer to access our software. We configure our Kerberos application and then read from the file keytab generated on a Windows Server 2003 or 2008 domain controller by using Kerberos V5 found in the AD domain controllers.

When you run the ktpass tool, you must submit the username and password to generate the keytab file.  When it is generated, there is a generated KVNO number / incremented in the keytab file.  But it writes the file first and then updates the KVNO + 1 number in the actual key stored in AD.  If your keytab file is always number 1 behind what is actually stored in AD!

We can fix it by running ktpass once,

Examine the properties for the KVNO number in the last keytab file

Re-run the ktpass, but number KVNO + 1

The keytab file is generated, AD wrote the new KVNO + 1 number in AD

But now our keytab file matches KVNO number generated by AD

We lose a step in the ktpass tool?

is there a way to see what the current number of KVNO is set in AD

We have tested extensively with Windows 2003 and Windows 2008 R2 domain controllers

The guests were the two Windows 7 Prof 64 bit

Was just curious if anyone has had this experience?

Thanks in advance,

Terry Ball

Hello Terry,

According to the description of the problem, it seems that you are working on Windows server 2003 and 2008. I would recommend posting your query on the Server Forums TechNet for Windows.

TechNet is watched by other computing professionals who would be more likely to help you. Please check the below link which will redirect you to the appropriate forum.

http://social.technet.Microsoft.com/forums/WindowsServer/en-us/home?Forum=winserver8gen

Hope that the information provided is useful. Let us know if you have questions related to Windows, we will be happy to help you.

Kind regards

Tags: Windows

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