Windows Server 2008, DC, Security Logs Audit Failure

Why does it look like this event is saying that Windows is blocking itself from binding to a port?

Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          4/8/2009 2:02:06 PM
Event ID:      5159
Task Category: Filtering Platform Connection
Level:         Information
Keywords:      Audit Failure
User:          N/A
Computer:      AD3.abacus-corp.com
Description:
The Windows Filtering Platform has blocked a bind to a local port.
 
Application Information:
	Process ID:		580
	Application Name:	\device\harddiskvolume1\windows\system32\lsass.exe
 
Network Information:
	Source Address:		0.0.0.0
	Source Port:		50122
	Protocol:		17
 
Filter Information:
	Filter Run-Time ID:	0
	Layer Name:		Resource Assignment
	Layer Run-Time ID:	36
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-a5ba-3e3b0328c30d}" />
    <EventID>5159</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12810</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8010000000000000</Keywords>
    <TimeCreated SystemTime="2009-04-08T21:02:06.411Z" />
    <EventRecordID>22879734</EventRecordID>
    <Correlation />
    <Execution ProcessID="4" ThreadID="84" />
    <Channel>Security</Channel>
    <Computer>AD3.abacus-corp.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="ProcessId">580</Data>
    <Data Name="Application">\device\harddiskvolume1\windows\system32\lsass.exe</Data>
    <Data Name="SourceAddress">0.0.0.0</Data>
    <Data Name="SourcePort">50122</Data>
    <Data Name="Protocol">17</Data>
    <Data Name="FilterRTID">0</Data>
    <Data Name="LayerName">%%14608</Data>
    <Data Name="LayerRTID">36</Data>
  </EventData>
</Event>

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