Trying to open a connection socket

You are missing the import library - add

#pragma comment ( lib, "ws2_32.lib")

to your code. Furthermore, you need to call 'WSAStartup()' before using sockets, e.g.

#include <Winsock2.h>
#include <string.h>
#include <stdio.h>

#pragma comment ( lib, "ws2_32.lib")

int main(int argc, char* argv[])
{
    char url[14];
    SOCKET socket;
    SOCKADDR_IN ip_addrs;
    int connResult = 0;

    int             nErr                =   0;
    WORD            wVersionRequested;
    WSADATA         wsaData;
 
    wVersionRequested   =   MAKEWORD(   1,  1);

    if  (   nErr = WSAStartup   (   wVersionRequested,  &wsaData))
        {  
            printf  (   "\nunable to initialize WINSOCK, reason: %d\n",
                        nErr
                    );
            exit    (   0);
        }


    //Setting up the IP Address structure
    ip_addrs.sin_family = SOCK_STREAM;
    ip_addrs.sin_port = 25;
    ip_addrs.sin_addr.S_un.S_un_b.s_b1 = 189;
    ip_addrs.sin_addr.S_un.S_un_b.s_b2 = 136;
    ip_addrs.sin_addr.S_un.S_un_b.s_b3 = 145;
    ip_addrs.sin_addr.S_un.S_un_b.s_b4 = 10;

    printf("Starting mail application \n");
    printf("Name length = %d\n",sizeof(ip_addrs));

   
    connResult = connect(socket,(sockaddr*)&ip_addrs,sizeof(ip_addrs));
    if(connResult==0) printf("Connection OK...!\n");
    else printf("Connection Failed...!!!\n");
    return 0;
}

Is not enough to "#include <Winsock2.h>" ?????

Do I still have to include the statement #pragma comment ( lib, "ws2_32.lib") ????

Thanks. That was the problem, but I would have understand it better if you would have told me that your solution meant to add the library Ws2_32.lib in the linker's path.

Any way thanks a million again.
p.s. You guys are doing a terrific job!