missing network information in event log for windo

问题:

I have an application which will display event log of Security -> AuditFailurein c#, i am reading it with EventLogEntry class's Message property, i am testing it on Window server 2008 R2

When a failure event log generated from machine like Window Server 2008 R2 or Windows XP then it generates IP Address as well as Port Number under network information section, but log generated for Windows 7 machine does not contain IP Address as well as Port Number.