Cannot able to connect to another host

Question

After few self tests, I thought I'm having a telnet problem. So I am recreating a shorter version of this question

I have two machines:

1. cassandra is running on one machine using IP 172.17.1.XX.
2. ???

My java program is:

 public static void main(String a[])
 {
   System.out.println("I am in");
   Client client = new Client();
   client.connect("172.17.1.XX");
   client.close();
 }

 public static void connect(String node)
 {
    cluster = Cluster.builder().addContactPoint(node).withPort(9160).build();
    Metadata metadata = cluster.getMetadata();
 }

If I run this program in the cassandra machine, it works. If I run the same program from my second machine, the output is:

Exception in thread "main" com.datastax.driver.core.exceptions.NoHostAvailableException: 
All host(s) tried for query failed (tried: /172.17.1.XX:9160 (com.datastax.driver.core.TransportException: [/172.17.1.XX:9160] Cannot connect)) 
at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:196) 
at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:80)
at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1145)
at com.datastax.driver.core.Cluster.getMetadata(Cluster.java:313)
at com.example.cassandra.Client.connect(Client.java:18)
at com.example.cassandra.Client.main(Client.java:74)

Using netstat -plten on the cassandra machine returns

`9160 port is open for all. 0.0.0.0:9160`

If I use: telnet 172.17.1.XX 9160 ???on what machine??? and type something and hit enter, the output is:

Connection closed by foreign agent

I tried the same telnet in the cassandra system with ip and localhost, i am getting the same behaviour.

telnet localhost 9160

accepts 3 inputs and says connection closed by foreign agent whereas ip accepts only two inputs. What is it?

I have three questions:

1. Why am I getting this error?
2. Does cassandra not a service which accepts data from telnet?
3. How do I solve this?