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How do I check if an address/port is already in use?

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nichols (VIP)

Hi

Dim chan As Tcp.TcpChannel
chan = New Tcp.TcpChannel(9213)
ChannelServices.RegisterChannel(chan)
RemotingConfiguration.RegisterWellKnownServiceType(GetType(HelloWorld),
"HelloWorld", WellKnownObjectMode.SingleCall)

This code will normally produce an error if the port 9213 is in use as
follows:
An unhandled exception of type 'System.Net.Sockets.SocketException'
occurred in system.runtime.remoting.dll
Additional information: Only one usage of each socket address
(protocol/network address/port) is normally permitted

However I have situation where the port is in use (I used Port Reporter
from MS to find out which ports were in use) and I don't receive an error.
This causes remoting to hang.

Is there a simple way to find out every port that is currently in use in
..Net? So that I can obtain a port that isn't in use and open it for
exlusiveAddressUse.

Thanks
Leslie Nichols

Reply to this message...

Robert Jordan

Hi,

[Original message clipped]

you may try this (C#):

try {
int port = FindUnusedPort(IPAdress.Any);
}
catch (SocketException) {
// no free ports
}

....

using System;
using System.Net;
using System.Net.Sockets;

....

public int FindUnusedPort(IPAddress localAddr) {
for (int p = 1024; p <= IPEndPoint.MaxPort; p++) {

Socket s = new Socket(AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp);
try {
s.Bind(new IPEndPoint(localAddr, p));
s.Close();
return p;
}
catch (SocketException ex) {
// EADDRINUSE?
if (ex.ErrorCode == 10048)
continue;
else
throw;
}
}
throw new SocketException(10048);
}

}

Reply to this message...

	System.Net.IPAddress
	System.Net.IPEndPoint
	System.Net.Sockets.AddressFamily
	System.Net.Sockets.ProtocolType
	System.Net.Sockets.Socket
	System.Net.Sockets.SocketException
	System.Net.Sockets.SocketType
	System.Runtime.Remoting.Channels.ChannelServices
	System.Runtime.Remoting.Channels.Tcp.TcpChannel
	System.Runtime.Remoting.RemotingConfiguration
	System.Runtime.Remoting.WellKnownObjectMode

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