According to MSDN this should work...

use strict;
use Win32::OLE;

my $server = "ogre";

my $secobj = Win32::OLE->GetObject("IIS://$server/W3svc/1/Root")
     or die "Couldn't get object:$!\n";

my $MyIPSec = $secobj->{IPSecurity};
$MyIPSec->{GrantByDefault} = 0;

$secobj->{IPSecurity} = $MyIPSec;
$secobj->SetInfo();
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Simon Flack ($code or die)
$,=reverse'"ro_';s,$,\$,;s,$,lc ref sub{},e;$,
=~y'_"' ';eval"die";print $_,lc substr$@,0,3;