求SOCKET高手求解

求助 求SOCKET高手求解
做主动模式FTP，服务器接收了客户端发来的IP地址与端口，反向链接失败，这是什么问题：错误提示10060
SOCKADDR_IN J_drClient;
memset(&J_drClient,0,sizeof(J_drClient));
J_drClient.sin_addr.S_un.S_addr=inet_addr(J_IP);
J_drClient.sin_family=AF_INET;
J_drClient.sin_port=htons(J_Port);

int r = connect( DataSocket, 
  ( struct sockaddr * )&J_drClient, sizeof(SOCKADDR_IN) );
if (r==-1)
{
  printf("连接失败\n");
}
注：其中J_IP为客户端发来的地址，J_PORT为客户端发来的端口，客户端会字节开这个端口进行监听。我同一台电脑开服务器和客户端都能链接上。但是不是同一台电脑之间就会返回链接失败

[解决办法]
如果是不同电脑之间，你要确保主机都把需要的端口开通
[解决办法]
WSAETIMEDOUT
10060
Connection timed out.
A connection attempt failed because the connected party did not properly respond after a period of time, or the established connection failed because the connected host has failed to respond.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx
[解决办法]
遇到这种情况，可以先用telnet IP port到监听端确认监听服务是否正常启动。