Live Communication Server Event Error

Not sure if this is the right place to post this, but am getting the
following error that I don't understand the meaning of. It happens everyday
with different users and is usually within minutes after their initial
Windows Messenger sign on:

Event Type: Error
Event Source: Live Communications Server
Event Category: (1003)
Event ID: 16433
Date: 2/22/2005
Time: 8:14:35 AM
User: N/A
Computer: SERVER1
Description:
At least one replayed message was detected. There were 1 replays in the last
20 minutes. The last one detected had the following FROM header:
sip:username@ourdomain.com. This could be due to a client or server which is
not handling authentication correctly, or it could be due to an attacker
replaying network messages.

nschloss:

There is a newsgroup microsoft.public.livecomm.general. Someone can
definitely help you out.

I don't know what hte error is exactly...the thing I would suspect is that a
user is pointed directly to a LCS 2005 Server in an LCS 2005 Enterprise
Edition environment and not to a LCS 2005 Pool.

Bob
"nschloss" <nschloss@discussions.microsoft.com> wrote in message
news:9C99382E-3E6E-4B5E-B119-93EBCAAB3680@microsoft.com...
> Not sure if this is the right place to post this, but am getting the
> following error that I don't understand the meaning of. It happens
everyday
> with different users and is usually within minutes after their initial
> Windows Messenger sign on:
>
> Event Type: Error
> Event Source: Live Communications Server
> Event Category: (1003)
> Event ID: 16433
> Date: 2/22/2005
> Time: 8:14:35 AM
> User: N/A
> Computer: SERVER1
> Description:
> At least one replayed message was detected. There were 1 replays in the
last
> 20 minutes. The last one detected had the following FROM header:
> sip:username@ourdomain.com. This could be due to a client or server which
is
> not handling authentication correctly, or it could be due to an attacker
> replaying network messages.
>