Seeing continous "Windows Account Locked" alert in Cisco IPS

Hi,
Can any one have any idea on why we are seeing huge number of "Windows Account Locked" alert in Cisco IPS device towards only one Windows server.
We checked whether Windows server is generating any malicious traffic by scanning the server but nothing is found
Feb 23 2011 20:05:47
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:05:32
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:04:47
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:04:32
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:03:47
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:03:32
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:02:47
Windows Account Locked
Cisco Intrusion Prevention System
Feb 23 2011 20:02:32
Windows Account Locked
Cisco Intrusion Prevention System

Mustafa,
Here are the signature details:
http://tools.cisco.com/security/center/viewIpsSignature.x?signatureId=5605&signatureSubId=0&softwareVersion=6.0&releaseVersion=S262
This signature detects a Windows SMB user account  that has been locked on the Windows server due to multiple failed logon  attempts, via the "STATUS_ACCOUNT_LOCKED_OUT" message returned to the  client.
This signature severity is set by default to 'informational'
Hence all the signature is doing is leeting you know some users were locked out due to multiple logon attempts.
The event details will also reveal victim ip which might be the machine on which the logon attempts were tried.
Let me know if this addresses your concern.
- Sid

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