topic Re: could not connect telnet in linux machine in Operating System - Linux

could not connect telnet in linux machine

ratheesh_1 — Wed, 26 Jul 2006 23:24:45 GMT

hello admins..
could not use my telnet protocol?? the machine says connection closed by foreign host.

Re: could not connect telnet in linux machine

Ivan Ferreira — Wed, 26 Jul 2006 23:32:40 GMT

What Linux distro are you using?

Is the telnet-server package installed?
rpm -qa |grep telnet

Is the telnet service enabled?
chkconfig telnet on

By default, telnet is not installed and disabled because of security restrictions.

You should use ssh instead.

Re: could not connect telnet in linux machine

Jeroen Peereboom — Thu, 27 Jul 2006 00:43:41 GMT

And check /etc/xinetd.d/telnet: disable=no.
If yes, set it to no and restart xinetd (kill -HUP

JP

Re: could not connect telnet in linux machine

IT_2007 — Thu, 10 Aug 2006 10:17:45 GMT

use ssh instead of telnet since this is disabled by default.

Thanks,
Srini

Re: could not connect telnet in linux machine

g33k — Fri, 11 Aug 2006 02:55:46 GMT

1)check telnet is installed and running as described above....
also you can use
ps axu | grep telnetd
to see if telnet is running.

2)if it's running and you are still not able to connect, check /etc/hosts.allow and /etc/hosts.deny

those file define access for hosts and networks... check host you are using to connect is in hosts.allow and isn't in hosts.deny

3)2nd step is OK then maybe access is blocked by firewall, iptables -L and check if telnet is allowed, and from where...
if you have firewall maschine between server with telnet and host you are accessing form you should also check this one...

it's quite depnedendent on network... so more specifications will help as to determine where problem is...

anyway as was said above. telnet is not secure, even any fucking script kiddie could sit on network and sniff, if you will use telnet he will know your password, even worse if you log as root or su during the session, he then will have full access to system and will able to do what ever he wants...
ssh is crypted so sniffing is nonsences only useble attack is man in the midle which is easy to recognize...

P.S.:if you have any additional question about security you can conntact me on mail g33k@seznam.cz