The following code creates a socket to the given host and port number, and tries to establish a connection with it. Based on this, we could find whether the port is in use(Closed) or not in use(Open).
string hostname = "server1"; int portno = 9081; IPAddress ipa = (IPAddress) Dns.GetHostAddresses(hostname)[0]; try { System.Net.Sockets.Socket sock = 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) // Port is in use and connection is successful MessageBox.Show("Port is Closed"); sock.Close();
} catch (System.Net.Sockets.SocketException ex) { if (ex.ErrorCode == 10061) // Port is unused and could not establish connection MessageBox.Show("Port is Open!"); else MessageBox.Show(ex.Message); } }
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| Author: Abhishek Arya 22 Sep 2008 | Member Level: Diamond Points : 0 |
Good one it works for me
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