Telnet in UNIX throug a socket

Question

I am trying to connect using a socket to a server running unix OS. The code uses the class Socket with this directive.
Socket sock = new Socket(servername,23);
BufferedInputStream in = new BufferedInputStream(sock.getInputStream());
//and then i start to read from the server with:
int byte_n = in.available();
Byte buff[] = new Byte[byte_n];
byte_n = in.read(buff);
//the problem is the bytes the program return available is zero, but the socket shows conected and if I try to connect with the Windows telnet from the command line I receive response (the initial message and the request for login and password).
My code works if I connect to other server running non UNIX OS.

Answer 1

That's not my problem... I've already tried using a buffer but it doesn't work yet...
Here is part of my code...
try {
socket = new Socket(server, port);
System.out.println("Connected with server " +
socket.getInetAddress() +
":" + socket.getPort());
catch (UnknownHostException e) {
System.out.println(e);
System.exit(ERROR);
catch (IOException e) {
System.out.println(e);
System.exit(ERROR);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
char inchar = 'a';
while(inchar != 'n')
inchar = (char)in.read();
System.out.println(inchar);
I am trying to connect through port 23. I know the socket is gettiing connected but I never receive any byte in the socket input stream. In the example I am geting a char, but I I have proved with the readline() method too, and it doesn't work... The code works if I try to connect to a Cisco Switch... I don�t know if thte UNIX OS has any particular configuration.......