What is prisoner.iana.org

I have a PC installed with Windows XP SP2, authenticating to a network, the
Domain Controller for which is running Windows 2000 Service Pack 4.

Recently I've noticed that at regular intervals (every hour/90 minutes), my
PC writes the following entry into the System Event Log:

Source: LSASRV
Category: SPNEGO (Negotiator)
Type: Warning
Event ID: 40961

Description: The Security System could not establish a secured
connection with the server DNS/prisoner.iana.org. NO authentication
protocol was available.

When I researched Event ID 40961 on the Microsoft website, it seemed to
indicate that this error would normally appear after promoting a Windows
2003 server to Domain Controller. However, I'm not running Windows 2K3
anywhere on my network.

To the best of my knowledge, this error does not appear on my (newly
rebuilt) server, or indeed on my laptop. It seems only to be on this one
PC. Furthermore, the PC is hanging, for no apparent reason. Although it
doesn't do this after each time the above error has been written into the
log, it certainly seems that, now and again, the PC hangs/crashes after this
entry has been written.

I have the following questions:

1. What is causing this warning to be written to the system log;
2. What can I do to stop this warning appearing in the future;
3. Is this warning a notification of something taking place that is
subsequently causing my machine to hang now and again;

For anyone who's wondering, I've also got the most uptodate version of
Microsoft AntiSpyware on my PC. Although I know that this doesn't catch
everything that tries to get through, it certainly grabs a fair amount of
stuff. Also, I'm fairly sure that my crashing problem is not caused by
hardware such as memory, because I'm not seeing a BSOD when the machine
crashes.

I hope that someone can help me. I'm on the point of being about to rebuilt
my PC in the hope that it will cure the problem. However, I don't want to
do that if the problem is going to recur as the result of something being
incorrectly set, either on the PC or on the Server.

TIA


.

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