mjhjmtu

Here are 2 servers

• 192.168.0.12


• 192.168.0.21

there is a service running in 50070 port in server 192.168.0.12

when I do telnet from 192.168.0.21 server it fails:

$telnet 192.168.0.12 50070
Trying 192.168.0.12...
telnet: connect to address 192.168.0.12: Connection refused

When I give hostname then also it fails:

$telnet master1.mycluster 50070
Trying 192.168.0.12...
telnet: connect to address 192.168.0.12: Connection refused

Even when I try from 192.168.0.12 it fails if I give the IP address:

$telnet 192.168.0.12 50070
Trying 192.168.0.12...
telnet: connect to address 192.168.0.12: Connection refused

But it works if I give the hostname:

$telnet master1.mycluster 50070
Trying 127.0.0.1...
Connected to master1.mycluster.
Escape character is '^]'.

I found this question can not telnet to a server connection refuse, but I tried all the possibilities. These are what I tried:

1. Turned off iptables in both the servers




2. Added ALL: ALL in cat /etc/hosts.allow




3. Made sure that the service is running in that port

But none of these work for me.

Here is my /etc/hosts

127.0.0.1 master1.mycluster master1
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.12 master1.mycluster master1
192.168.0.21 slave1.mycluster slave1

Is there anything else that I am missing to make it working ?

Your service is listening on the loopback address only, 127.0.0.1.

When you make a connection from 192.168.0.21 or when you specify the ip address it does not work, as your service is not listening on that ip.

When you use the hostname from 192.168.0.12 it works because it is connecting to the loopback address. This is because it will look in your hosts file first, /etc/hosts, which has an entry pointing that hostname to your loopback ip: 127.0.0.1 master1.mycluster