I'm (somewhat) able to reproduce the bug with the following code. On my machine it takes about 2 seconds before the first exception is hit. After the first exception, it's pretty much a continuous problem. I am baffled by the first exception however since the error talks about server response when SocketType is Dgram and the ProtocolType is Udp (I never received this exception in my application). Following that exception, the socket returns the "would block" exception event though the socket is set to Blocking.
Output follows listing:
Code Block
using System;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Net;
namespace ConsoleApplication3
{
class Program
{
// setup read and write sockets
static Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
static Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
static void Server()
{
byte[] buffer = new byte[10];
while (true)
{
try
{
server.Receive(buffer);
}
catch (Exception e)
{
Console.Out.WriteLine("Server exception: " + e.Message + " : Blocking = " + server.Blocking);
}
Console.Out.WriteLine("Server: received.");
server.Send(buffer);
}
}
static void Main(string[] args)
{
// sychronize output
Console.SetOut(TextWriter.Synchronized(Console.Out));
IPAddress addr = Dns.GetHostEntry(Dns.GetHostName()).AddressList[0];
server.Connect(addr, 0);
client.Connect(server.LocalEndPoint);
server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 500);
client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 500);
Thread serverThread = new Thread(new ThreadStart(Server));
byte[] buffer = new byte[6];
// client loop
while (true)
{
client.Send(buffer);
try
{
client.Receive(buffer);
Console.Out.WriteLine("Client received.");
}
catch (Exception e)
{
Console.Out.WriteLine("Client exception: " + e.Message + " : Blocking = " + client.Blocking);
}
}
}
}
}
Ouput:
Client exception: A connection attempt failed because the connected party did no
t properly respond after a period of time, or established connection failed beca
use connected host has failed to respond : Blocking = True
Client exception: A non-blocking socket operation could not be completed immedia
tely : Blocking = True
Client exception: A non-blocking socket operation could not be completed immedia
tely : Blocking = True
.
.
.
