Question : DNS/prisoner.iana.org

When looking thru my Windows 2k3 server's Event Viewer's System folder I can across multiple listings of this error:

The Security System detected an authentication error for the server DNS/prisoner.iana.org.  The failure code from authentication protocol Kerberos was "There are currently no logon servers available to service the logon request.
 (0xc000005e)".

In googling, I found out that it has something to do "blackholes" on the net. Can anyone tell me what this is & if it's some sort of threat? And if there is anything I can do about it on my Windows Server??

Thanks!

Answer : DNS/prisoner.iana.org

Not to worry. Good explanation here:
http://lists.jammed.com/incidents/2002/09/0049.html
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