JSI Tip 5899. Your Windows 2000 Server prompts domain users for credentials?

Microsoft Knowledge Base Article 305971 contains the following SYMPTOMS:

When a domain user tries to connect to a Windows 2000-based server that is a member of the same domain, the user may be prompted for credentials before being granted access.

You may also receive the following event in the event log:

Event Type:Error
Event Source:KDC
Event Category:None
Event ID:11
Description: There are multiple accounts with name host/SERVERNAME.microsoft.com of type10