What can be a possible cause
When my program running on a notebook connects the server, it gets the System.Net.Sockets.SocketException.
I try to ping the server by the domain name from the notebook. It's OK. So not related to domain name resolution or network stability problem.
I try to telnet to the server from the notebook directly and issue some commands. It's OK also. So not related to any firewall.
It just happens in a few notebooks in the same network.... what can be the possible cause
The following is the code.
if(ConnectSocketThread==null || !ConnectSocketThread.IsAlive)
{
ConnectSocketThread = new Thread( new ThreadStart(this.ConnectSocketThreadFunction) );
ConnectSocketThread.Name = "ConnectSocketThread";
ConnectSocketThread.Start();
}
ConnectSocketThread.Join(7000);
private void ConnectSocketThreadFunction()
{
while(true)
{
if(socket!=null && socket.Connected)
return;
else if(socket==null)
{
Thread.Sleep(30);
}
else
{
try
{
this.endPoint = new IPEndPoint(Dns.Resolve(Global.server).AddressList[0], Global.port);
this.socket.Connect(this.endPoint);
}
catch (Exception ex)
{
MessageBox.Show("ConnectSocketThread: (" + socket.Connected.ToString() + ")\n" + ex.ToString());
return;
}
}
}
}
very strange System.Net.Sockets.SocketException
S.Jan
Also see what Ilyas is saying:
See something like this:
catch(SocketExceptopn se)
{
string exceptionMessage = String.Fotmat("Message: {0} Socket Error: {1) SocketErrorCode{2}" se.Message, se.SocketError, se.SocketErrorCode);
}
This will help in identifying exact cause of the problem!
Best Regards,
Sean K. Campbell
Thanks!!! I will try and see if I can come back with anything.
rajbasav
skynes
Why Not
See this:
http://msdn2.microsoft.com/en-us/library/system.net.dns_methods.aspx
Check both functions and see effect of both!
Best Regards,
Smealum
OK
Highflier64
I cannot find Dns.GetHostEntry()
I now use Dns.GetHostByName(server).AddressList[0];
is that OK
matiaswoloski
Please Mark the Helpfull Post(s) as answered
.
Best Regards,
asmith48
I changed the code as follows and that computer in the Wireless LAN can connect to the server. Thanks everybody!
try
{
if(this.ipAddress==null)
{
this.ipAddress = Dns.GetHostByName(Global.server).AddressList[0];
}
this.endPoint = new IPEndPoint(this.ipAddress, Global.port);
this.socket.Connect(this.endPoint);
}
catch (SocketException se)
{
string errorMesg = String.Format("Message: {0}\nNativeErrorCode: {1)\nErrorCode: {2}", se.Message, se.NativeErrorCode, se.ErrorCode);
MessageBox.Show("ConnectSocketThread1: " + errorMesg);
MessageBox.Show("ConnectSocketThread2: " + se.ToString());
return;
}
catch (Exception ex)
{
MessageBox.Show("ConnectSocketThread3: " + ex.ToString());
return;
}
Duncan_
Dns.Resolve() is depricated in .Net 2.0 so if you are using it in .Net 2.0 try to change it to Dns.GetHostEntry() etc and see what happens.
Best Regards,
BobH
I dont have the error message now but I remember it's kinda the text/explanation you see in the Object browser in VS2003 for System.Net.Sockets.SocketException.
Citrus
You should atlease give it a try. They have depricated it from the newer version of .Net. May be there are some problems like this on new Wifi Tech etc.
We dont have to spend anything more than changing 2-3 lines of code. Let's See what happens.
Best Regards,
LouArnold
Thanks. But I think it should not be the cause. I'm using .Net 2.0 on my PC and doesnt have any problem with the code.
The network where the notebook having problem with the code connected is a Wireless LAN. I wonder if anything can go wrong with that Wireless LAN. Any experience to share
WinFXGuy