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POObtain the list of open ports, windows firewall
 

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  1. POObtain the list of open ports, windows firewall
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    <p>I am trying to develop a code that manages the firewall ports using vb.net. The first part is to list all ports enabled. so I am trying this code:</p> <pre><code>Function portsList() Dim ports As INetFwOpenPorts Dim port As INetFwOpenPort Dim myPorts() As INetFwOpenPorts Dim NetFwMgrType As Type = Type.GetTypeFromProgID("HNetCfg.FwMgr", False) Dim mgr As INetFwMgr = DirectCast(Activator.CreateInstance(NetFwMgrType), INetFwMgr) ports = DirectCast(mgr.LocalPolicy.CurrentProfile.GloballyOpenPorts, INetFwOpenPorts) Dim enumerate As System.Collections.IEnumerator = ports.GetEnumerator() Dim i As Integer While enumerate.MoveNext() port = DirectCast(enumerate.Current, INetFwOpenPort) myPorts(i) = port i += 1 End While Dim portAsString() As String For j As Integer = 0 To i portAsString(j) = myPorts(j).ToString Next Return portAsString End Function Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click Dim ports() As String = portsList() Dim n As String = ports.Length Dim newString As String = "" For h As Integer = 0 To n newString = ports(h) &amp; vbNewLine Next RichTextBox1.Text = newString End Sub </code></pre> <p>What I want to do is list all the ports in <code>Richtextbox1</code> after clicking <code>Button4</code>. The error that I am getting is: </p> <blockquote> <p>NullReferenceException was unHandled. Object reference not set to an instance of an object. </p> </blockquote> <p>I am new to Vb, how can I get over this?</p>
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    1. USSysDragon
    1. USJames Toporipo Banda
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    1. COHave you thought about scanning for open ports, instead of get a list from the firewall?
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      1. POObtain the list of open ports, windows firewall
      1. USSam
    2. COthanx @Sam I hadn't thought about it. Like i said, i want to block (close) some or all of these ports excerpt a few, how do i go about it in vb.net
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      1. POObtain the list of open ports, windows firewall
      1. USJames Toporipo Banda
    3. COHave a look [here](http://msdn.microsoft.com/en-us/library/aa366423.aspx) and [here](http://www.johnkoerner.com/index.php?/archives/49-Creating-a-Firewall-Exception-in-VB.Net.html). By the way, scanning each port to see whether its open or closed can take a while (about 30 mins on a remote machine).
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      1. USSam
 

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