How to ensure machine is "Kerberos Domain" joined?

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http://serverfault.com – i've been having issues where calls to the LogonUser Windows API function is falling back to NTLM authentication, rather than using the preferred, default, Kerberos authentication. Researching the problem, a guy has a suggestion: The thing to do is to figure out why the code is using NTLM instead of Kerberos in the first place since Kerberos is the default and to try to see if it can be changed to make it use Kerberos. A couple of things come to mind: The client machine must be domain joined to use Kerberos Now i've never heard of being domain joined to use Kerberos. E (HowTos)