Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

how to use vb.net to check if my winform application is block by firewall TCP/port

Posted on 2011-03-25
3
Medium Priority
?
1,211 Views
Last Modified: 2012-06-21
Hi
I want winform application to be aware of firewall that would block TCP and Port it is using.

Is there such code? to check if firewall is blocking?
0
Comment
Question by:JSW21
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 12

Accepted Solution

by:
Hairbrush earned 2000 total points
ID: 35213960
Hi

Yes, it is possible to do this.  You will need to use the System.Net.Sockets namespace in the .NET Framework.  Try the code below:
Dim hostname As String = "server1"
Dim portno As Integer = 9081
Dim ipa As IPAddress = CType(Dns.GetHostAddresses(hostname)(0), IPAddress)
Try
	Dim sock As System.Net.Sockets.Socket = New System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp)
	sock.Connect(ipa, portno)
	If sock.Connected = True Then ' Port is in use and connection is successful
			MessageBox.Show("Port is Closed")
	End If
	sock.Close()

Catch ex As System.Net.Sockets.SocketException
	If ex.ErrorCode = 10061 Then ' Port is unused and could not establish connection
		MessageBox.Show("Port is Open!")
	Else
		MessageBox.Show(ex.Message)
	End If
End Try

Open in new window

0
 

Author Closing Comment

by:JSW21
ID: 35217934
sock.close
will allow me to really connect it again later right?
0
 
LVL 12

Expert Comment

by:Hairbrush
ID: 35230399
Yes.
0

Featured Post

Veeam Disaster Recovery in Microsoft Azure

Veeam PN for Microsoft Azure is a FREE solution designed to simplify and automate the setup of a DR site in Microsoft Azure using lightweight software-defined networking. It reduces the complexity of VPN deployments and is designed for businesses of ALL sizes.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Is your data getting by on basic protection measures? In today’s climate of debilitating malware and ransomware—like WannaCry—that may not be enough. You need to establish more than basics, like a recovery plan that protects both data and endpoints.…

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question