The Windows Filtering Platform has allowed a connection

Our firewall has detected attacked on the OWA and I made sure that server is up to date, patches and also ran Microsoft Base Line Security Analyzer. Analyzer did not find much but suggested that we enable auditing on this server. We did.
Now we see this log all the time. Many entries. is Exchange server and is DC. I just don't understand how to understand this event. I'm guessing this is Exchange server constantly queering DC for AD rights? But anything specific?

Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          7/9/2015 4:11:14 PM
Event ID:      5156
Task Category: Filtering Platform Connection
Level:         Information
Keywords:      Audit Success
User:          N/A
Computer:      MRFFNTX2.MRFFNTD.local
The Windows Filtering Platform has allowed a connection.

Application Information:
      Process ID:            4
      Application Name:      System

Network Information:
      Direction:            Outbound
      Source Address:  
      Source Port:            8
      Destination Address:
      Destination Port:            0
      Protocol:            1

Filter Information:
      Filter Run-Time ID:      0
      Layer Name:            Connect
      Layer Run-Time ID:      48
Event Xml:
<Event xmlns="">
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-a5ba-3e3b0328c30d}" />
    <TimeCreated SystemTime="2015-07-09T23:11:14.515Z" />
    <Correlation />
    <Execution ProcessID="4" ThreadID="88" />
    <Security />
    <Data Name="ProcessID">4</Data>
    <Data Name="Application">System</Data>
    <Data Name="Direction">%%14593</Data>
    <Data Name="SourceAddress"></Data>
    <Data Name="SourcePort">8</Data>
    <Data Name="DestAddress"></Data>
    <Data Name="DestPort">0</Data>
    <Data Name="Protocol">1</Data>
    <Data Name="FilterRTID">0</Data>
    <Data Name="LayerName">%%14611</Data>
    <Data Name="LayerRTID">48</Data>
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Randy DownsOWNERCommented:
Your auditing is showing allowed connections.

If you want to turn it off you can try this.

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