I try to connect to localhost with telnet:

% telnet localhost 6311

This connection succeed, but when I connect by external IP of my computer, connection fails:

% telnet x.x.x.x 6311
Trying x.x.x.x...
Connected to x.x.x.x
Escape character is '^]'.
Connection closed by foreign host.

What could be wrong?

  • Firstly, the site address. Try on SuperUser or ServerFault.
    – H2CO3
    Commented May 5, 2013 at 13:29
  • I checked : % sudo telnet x.x.x.x 6311 same problem...
    – sunny
    Commented May 5, 2013 at 13:33
  • It's not a web server there, it is RServe.. Then I don't have any site address...
    – sunny
    Commented May 5, 2013 at 13:36

3 Answers 3


The problem was with the service ( that was running on 6311) The servise just was not configured to work with remote access.

It means, telnet was OK :)


Check what IP server is listening to. I am suspecting that your server is listening to localhost or Make it listen to (probably via some conf file).

You can verify it by running

netstat -tapnl | grep 6311

Check if it shows or

  • If this answer solves your problem, you can mark this as accepted answer.. :)
    – anishsane
    Commented May 14, 2013 at 7:00

first you need to see the 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)

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