Connection closed by foreign host

HI All

I am trying to telnet a server and within few seconds it pops me out .



[S][Fri Apr 13 23:49:45] ~]$telnet 10.137.81.158 5044
Trying 10.137.81.158...
Connected to 10.137.81.158.
Escape character is '^]'.
Connection closed by foreign


[~]$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b9750e12aec5 dev-ubuntu-docker.mycom-osi.com:5000/mycomosi/monitoring-logstash "supervisord -n -c /e" 6 hours ago Up 6 hours 0.0.0.0:5044->5044/tcp monitoring-logstash.container
d32058878d18 dev-ubuntu-docker.mycom-osi.com:5000/mycomosi/monitoring-influxdb "supervisord -n -c /e" 6 hours ago Up 6 hours 0.0.0.0:8083->8083/tcp, 0.0.0.0:8086->8086/tcp, 0.0.0.0:8089->8089/udp, 0.0.0.0:8088->8088/tcp, 0.0.0.0:25826->25826/udp monitoring-influxdb.container
[mycom@NVMBD1CGM270V04 ~]$

I can't speak to that particular server, but telnet is not secure in any way and many servers these days are configured to reject telnet connections. https://serverfault.com/questions/72...efused-message

I am also unfamiliar with docker and probably can't help you with your real problem but in addition to what frankbell posted telnet can be used to test a connection but since it is text protocol it will fail as posted when trying to connect to a service that uses a binary protocol.

As an aside, the last time I used Telnet, I was on DOS 5.1 on an x386 helping my daughter, who is now all grown up and a fully functional adult of whom I am very proud, connect with a newspaper in Brazil for her homework.

A web search for "telnet rejected" will turn up lots of useful stuff, but I would bet a dollar to a doughnut that the Telnet port is closed.

Port 5044 is the port for logstash (https://www.elastic.co/guide/en/beat...sh-output.html).

If you are to use telnet (or better, nc), you should know how the protocol works. AFAIK, this one is not an interactive text protocol.
So, the fact that you get a connection is an indication that it works.
If you want to do more, then you should use other tools that are suggested for this case.

See https://www.elastic.co/guide/en/beat...-logstash.html for more.