Winsock2 WSAGetLastError 10061

daniel · Sep 19th 2016

Dear support,

I have a problem with winsock2, i write a simple server and client application, the server sock runs without problems on the NETDCUA5.
And the client socket runs on a windows 10 machine. The communication between server and client socktet runs only in debug session (conmanclient3, cmaccpet3).

But start the server socket not in the debug mode, can`t connect the client. The WSAGetLastError return allways 10061, connection refused.

What is wrong ?

thank you

Daniel

fs-support_ZU · Sep 19th 2016

Hm very strange,
you are really sure that you use the same port for "bind" the "listen" on server side as the client tries to connect to?
Server is really waiting in "accept" for the connection from client?
Any code details?

daniel · Sep 19th 2016

Hi,

yes, its very strange
im really sure, both sockets runs on the same port (4444), and the server socket is waiting in "accept" for a client connection.
here is a code snippet from server:

Code

// service pin
swprintf(LogEntry_Service,L"Service PIN=%d",nPin);
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
// initialize winsock
swprintf(LogEntry_Service,L"Initializing winsock...");
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
if(WSAStartup(MAKEWORD(2,2),&wsa) != 0) {
swprintf(LogEntry_Service,L"Initializing, failed (err=%d)",WSAGetLastError());
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
return false;
}
// create master socket
swprintf(LogEntry_Service,L"Initialized winsock, successfully.");
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
if((ma=socket(AF_INET,SOCK_STREAM,0)) == INVALID_SOCKET) {
swprintf(LogEntry_Service,L"Create master socket, failed (err=%d)",WSAGetLastError());
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
return false;
}
// prepare sockaddr
srv.sin_family = AF_INET;
srv.sin_addr.s_addr = ADDR_ANY;
srv.sin_port = htons(4444);
// bind master socket
if(bind(ma,(sockaddr*)&srv,sizeof(srv))==SOCKET_ERROR) {
swprintf(LogEntry_Service,L"Bind master socket, failed (err=%d)",WSAGetLastError());
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
return false;
}
// listen to incoming connections
swprintf(LogEntry_Service,L"Bind master socket, done");
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
listen(ma,SERVICE_CLIENT_MAX);
// start service thread
addrlen = sizeof(sockaddr);
hService = CreateThread(NULL,0,ServiceThreadProc,(LPVOID)nPin,0,NULL);
if(hService == INVALID_HANDLE_VALUE){
swprintf(LogEntry_Service,L"Create service thread, failed\n");
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
return false;
}
SetThreadPriority(hService,THREAD_PRIORITY_HIGHEST);
srvrun = true;
servicerun= true;
swprintf(LogEntry_Service,L"Service Thread started",WSAGetLastError());
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());
swprintf(LogEntry_Service,L"Waiting for incoming connections...");
Log_Service->m_LOG_Write(LogEntry_Service,GetLastError());

Display More

and here is the client connection function from .NET 4.5

Code

private void bn_connect_Click(object sender, EventArgs e) {
try {
if((RMHostSocket == null)||(!RMHostSocket.Connected)) {
RMHost = new TcpClient();
RMHost.Connect("192.168.0.3",4444);
if (RMHost.Connected) {
RMHostSocket = RMHost.Client;
Receive = new Thread(new ThreadStart(m_ReceiveData));
Receive.Priority = ThreadPriority.Highest;;
Receive.Start();
}
}else {
if(Receive.ThreadState == ThreadState.Running) {
Receive.Abort();
}
RMHost.Close();
RMHostSocket.Close();
lb_connect.Text = "Connected: No";
lb_authorize.Text = "Authorized: No";
bn_connect.Image = JMT_160901_CLTDLG.Properties.Resources.disconnected_26;
tc_options.Visible = false;
}
}catch(Exception ex) {
lb_connect.Text = "Connected: No";
lb_authorize.Text = "Authorized: No";
bn_connect.Image = JMT_160901_CLTDLG.Properties.Resources.disconnected_26;
tc_options.Visible = false;
MessageBox.Show(ex.Message,"Connection Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
}
}

Display More

the firewall is disabled on client side. Its really really strange ..... starts the server socket from the IDE with "conmanlient3 and cmaccept3" runs the communication between server and client socket with no problems.

greetings

Daniels

fs-support_ZU · Sep 19th 2016

Hm, no idea.
But Telnet Server works so i assume the problem it is related to the port 4444, did you try a free port < 1024? E.g. 700.

daniel · Sep 19th 2016

Hi,

I have found the failure, the problem is the client

that works on client side, but its c++ not .NET

Code

// Setup our socket address structure
SOCKADDR_IN SockAddr;
SockAddr.sin_port = htons(4444);
SockAddr.sin_family = AF_INET;
SockAddr.sin_addr.s_addr = inet_addr("192.168.0.3");

ok, thank you for your help

greetings

Daniel

Winsock2 WSAGetLastError 10061

Share

Tags