Software

We are using Live Communication Server 2003 running on a Windows 2003 server with Messenger 5.1 clients. Each day my event viewer shows at least a couple of the following events for random users at time of the user logon. Can anyone shed light on this error for me?

Event Type: Error
Event Source: Live Communications Server
Event Category: (1003)
Event I 16433
Date: 3/3/2005
Time: 8:17:25 AM
User: N/A
Computer: SERVER1
Description:


At least one replayed message was detected. There were 1 replays in the last 34 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.