i have a private network with 2 machines with ips:
server 150.0.0.2
client 200.200.150.150

i made a ftp server which is listening to port 50006 for connection and then randomly pick new number between 60000:65000 for file transfer

i having trouble to connect to the server (even the beginning on port 50006) and i get connection refuse.
i have ping from client to server, i also turned off firweall

i am using redhat linux os

how do i open the ranges for listening ?

If you have turned off the firewall, you may need to open up the ports on the router to allow incoming.

What FTP server are you using?

used:

int sock;
struct addrinfo hints, *res;
int reuseaddr = 1; /* True */

/* Get the address info */
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(NULL, PORT, &hints, &res) != 0) {
perror("getaddrinfo");
return 1;
}

/* Create the socket */
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sock == -1) {
perror("socket");
return 1;
}

/* Enable the socket to reuse the address */
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(int)) == -1) {
perror("setsockopt");
return 1;
}

/* Bind to the address */
if (bind(sock, res->ai_addr, res->ai_addrlen) == -1) {
perror("bind!!!!");
return 0;
}

freeaddrinfo(res);

which is only for same machine connection, changed it to:

struct sockaddr_in ip4addr;
ip4addr.sin_family= AF_INET;
ip4addr.sin_port = htons(p2);
inet_pton(PF_INET,"10.0.0.2",&ip4addr.sin_addr);

/* Create the socket */
sock=socket(PF_INET,SOCK_STREAM,0);
if (sock == -1) {
perror("socket");
return 1;
}


/* Bind to the address */

bind(sock,(struct sockaddr*)&ip4addr,sizeof ip4addr);

---------- Post added 07-20-14 at 02:45 PM ----------

and changed ip as well ofcourse