Security: 529 and NTLMSSP Process

I'm reviewing a Security:529 event for a Logon Failure and need help understanding why it is occurring. The event is coming from a domain controller running Windows Server 2003. The event states that it is a result of a laptop on the domain using process
name NTLMSSP attempting to authenticate against the domain controller using the machine account (MachineName$). Logon type is 3, Event Log Category is Logon/Logoff, Event Source is Security and Authentication Packet is NTLM. 
1. Why is the machine using NTLMSSP instead of Kerberos?
2. What is the purpose of the MachineName$ account authentication?
3. How can I troubleshoot why this failure was received?
Thanks!

Hi,
1. Why is the machine using NTLMSSP instead of Kerberos?
Since the logon type is 3, this is not an Interactive logon event, instead, it’s a Network logon event which provides access to network resources.
2. What is the purpose of the MachineName$ account authentication?
Every domain-joined machine has a machine account with a password in Active Directory, the authentication purpose is the same as user account, to verify if the machine is genuine.
3. How can I troubleshoot why this failure was received?
You need to view events around this one, if there are multiple Event 529 during a short time, which could indicate that there are services/applications/devices storing a wrong password.
More information for you:
Microsoft NTLM
http://msdn.microsoft.com/library/aa378749(VS.85).aspx
Machine Account Password Process
http://blogs.technet.com/b/askds/archive/2009/02/15/test2.aspx
Best Regards,
Amy

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