Socket shuts down unexpectedly

[SBC]

Hello,

I have developed a windows service using C#, TcpListener class and its only
function is to listen for clients to connect and send back a respsonse. I
have a customer who states that everyday they need to restart the service so
that the application starts listening on the sockets again.

I have not been able to recreate this situation and don't know why the
socket would shutdown. Can anyone point me to a reason why sockets would
shutdown unexpectedly?

Within the constructor I create a new TcpListener object...

<start of code snippet>
//start listing on the given port
port = Convert.ToInt32 (sPort);
_tcpListener = new TcpListener(ipA ddress, port) ;
_tcpListener.St art();

//start the thread which calls the method 'StartListen'
m_thread = new Thread(new ThreadStart(Sta rtListen));
m_thread.Start( ) ;
<end of code snippet>
in my next snippet for "StartListe n" I wait until a client connects...
<Start Snippet>
StartListen()
{
// variables here...
while(true)
{
// Accept a new connection
Socket _clientSocket = _tcpListener.Ac ceptSocket();
if (_clientSocket. Connected)
{
// At this point we have another application that does logging since the
windows
// service does not have a user interface...
TcpClient _tcpClient = new TcpClient();
try
{
_tcpClient.Conn ect(ipAddress, port)
NetworkStream ns = _tcpClient.GetS tream();
BinaryWriter bw = new BinaryWriter(ns );
bw.Write(sb.ToS tring());
_tcpClient.Clos e();
sb.Remove(0, sb.Length); // sb is a StringBuilder
}
catch(Exception ex)
{
// stuff
}
}
}
One of the things I have recently read is that I need to close the
NetworkStream also, do you think this would cause the sockets to shutdown?
So far I don't receive any types of error messages, the socket just seems to
stop communicating and the windows service needs to be rebooted...

Thank you for your time and help.