Checking if ip with port is available?

Question

I need to know how to check if an IP with Port is working to connect to. Port is 7171, and I'm using Visual Studio C# Express 2010 .NET.

tried Google? here: http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping.aspx — mtijn, Jan 23 '12 at 09:34
Why do you want to do that? Have you tried just opening a connection? — svick, Jan 23 '12 at 09:35
@mtijn, ping doesn't work with specific ports, just IP addresses. — svick, Jan 23 '12 at 09:36
use portquery to check post status. Ex: portqry -n ip address -e port number — Sai Kalyan Kumar Akshinthala, Jan 23 '12 at 09:39
@svick: Im hosting a server and want to restart it when connection lost xd — Marcus, Jan 23 '12 at 10:47

score 4 · Accepted Answer · answered Jan 23 '12 at 09:36

To check ip is working you can do a ping using your code and opening cmd from your code.

You can check if port is free assuming you are using tcpclint :

int port = 456; //<--- This is your value
bool isAvailable = true;

IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
 TcpConnectionInformation[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpConnections();

 foreach (TcpConnectionInformation tcpi in tcpConnInfoArray)
 {
   if (tcpi.LocalEndPoint.Port==port)
   {
     isAvailable = false;
     break;
   }
 }

Checking if ip with port is available?

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