No connection could be made because the target machine actively refused it

[thupham]

On the Client Side, I programmed on Socket, when try to make connect Server and Client on the internet (WAN). I met 2 exception

1) No connection could be made because the target machine actively refused it
2)A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied.
public void Connect(string Host,int port){
try
{
create(this,null);
IPHostEntry he = Dns.Resolve(Host);
IPEndPoint ep = new IPEndPoint(he.AddressList[0], port);

if(m_BlockingMode)
{
m_Socket.Connect(ep);
return;
}
m_Socket.BeginConnect(ep,new AsyncCallback (OnSendEvents),"connect");
RecieveEventArgs rv = new RecieveEventArgs();
rv.m_DataLength = 255;
m_Socket.BeginReceive(rv.m_bytesArray,0,255,Socket Flags.None,new AsyncCallback(OnSendEvents),rv);
}
catch(SocketException ex)
{
MessageBox.Show(ex.Message);
}
}

and I met bug OnSendEvents
void OnSendEvents(IAsyncResult ar)
{
string s = ar.AsyncState.ToString();
switch(s)
{
case "connect":
connect(this,null);
if(ar.IsCompleted)
m_Socket.EndConnect(ar);
break;
case "send":
if(ar.IsCompleted)
m_Socket.EndSend(ar);
send(this,null);
break;
default :
RecieveEventArgs e = (RecieveEventArgs) ar.AsyncState;
e.m_ar = ar;
recieve(this,e);
break;
}
}

Can you help me.
Thu
Thanks
[email removed - against site rules]

[epots9]

can you ping the other computer?
are you behind a firewall?

[thupham]

Yes, now I make connection at LAN succeed. But when I try to do in WAN, 2 computer can't connect, I just set IP public for server then NAT (in coming + out coming ). In the Client, I have more Clients, then I want to used IP Private. With Router ADSL of Client I NAT incoming, and I also stop firewall, but they still can't connect. they appear 2 bugs like before.
Have you ever programmed socket in WAN?
Can you help me.
Thanks for reply for me
Thu