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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?
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 127.0.0.1. Make it listen to 0.0.0.0 (probably via some conf file).
You can verify it by running
netstat -tapnl | grep 6311
Check if it shows 127.0.0.1:6311 or 0.0.0.0:6311
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)
