Socket problem (half-open?)

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4.00/5 (1 vote)

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Dear readers,

I have a windows service (client) which basically should be up 24/7, however sometimes the connection drops.
Basically what happens is that i send a command to the service, and i will get the response "An existing connection was forcibly closed by the remote host".

Now what i would expect is that the IsConnected function (called from timer) notices that the connection has dropped and restarts the connection but it doesn't actually notice that the connection has closed.

C#

private bool IsConnected(Socket socket)
{
    try
    {
        return !(socket.Poll(100, SelectMode.SelectRead) && socket.Available == 0);
    }
    catch (SocketException) { return false; }
}

But it doesn't seem to work..
Another idea was to actually send data as a keep alive, but if the timer event raises while for example the socket is in the middle of transferring a file it goes to hell.

Socket:

clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
     clientSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, 1);

     IPEndPoint ipEnd = new IPEndPoint(IPAddress.Loopback, 1500);

     clientSocket.Connect(ipEnd);

Any suggestions are very welcome,

Thanks!

Posted 1-Jun-11 11:46am

Scalee

Updated 2-Jun-11 1:23am

v4

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Comments

Mathew Crothers 1-Jun-11 22:44pm

Do you mean that the socket on the service fails, or that clients connected to the service drop their connections?

Ankit Rajput 2-Jun-11 0:36am

Your problem is not clear. If you are getting any exception then please update your question with Exception.

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LaxmikantYadav · Accepted Answer · 2011-06-02T01:43:00

Hi Scalee,

Your First approach is correct one, try with this

private bool IsConnected(Socket socket)
{
    try
    {
        if(socket.Connected)
          return !(socket.Poll(100, SelectMode.SelectRead) && socket.Available == 0);
        else
          return false; 
    }
    catch (SocketException) { return false; }
}