telnet: Unable to connect to remote host: Connection refused

Question

I am inside docker and I have installed zookeeper and trying to test it using telnet But it is not working

$ telnet localhost 2181
Trying ::1...
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused

I tried these also

telnet 127.0.0.1 2181
telnet 172.17.0.2 2181

But same error.

netstat status

# netstat -tlpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

Please help.

Solution 1

Verify zookeeper is actually running, via

ps aux | grep -i zookeeper

If it is, then it may not be bound to 127.0.0.1 or 0.0.0.0. So check which IP address it's actually bound to,

netstat -tlpn

Then try to telnet to it using that address.

Solution 2

check your ubuntu system log with this command

sudo gedit /var/log/syslog

and if you will see this error "execv( /usr/sbin/tcpd ) failed: No such file or directory" then run this command

sudo apt-get install tcpd

it will solve your problem (if not then you need to search your system error on google)

Comments

[Avinash]

Just now I found even telnet locahost is not working. Has same error.

[TLin]

Simply using telnet localhost would attempt to connect to a local server process listening port 23. Most servers/containers I know don't enable telnet servers by default since it's insecure.

[Avinash]

Any idea how to fix it.

[TLin]

Can you update your post with the output of netstat -tlpn

[Avinash]

I have updated.

[TLin]

It's clear from your netstat output that there's no server process listening. Are you sure zookeeper is running? I suggest trying out this guide if you haven't already: zookeeper.apache.org/doc/r3.3.3/zookeeperStarted.html

[thewebjackal]

Did you check your firewall?