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Old 05-29-2007, 08:00 AM   #1
Azzath
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Registered: Jan 2005
Location: Russia
Distribution: Mandrake, CentOS
Posts: 138

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CentOS server not accepting Telnet requests


Hi Guys,
I have a CentOS 5.0 server newly installed and trying to configure telnet on it.
I have done the following already
Code:
0n the xinetd.d/telnet file

# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
disable = No //Done this
flags = REUSE
socket_type = stream 
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}
Then I have started the vsftpd deamon
Code:
/etc/init.d/vsftpd start
Then
Code:
/etc/init.d/xinted reload
When I telnet my server I get this Error..
Code:
"Unencrypted connection refused. Goodbye".
I have read previous threads and cannot find a solution from them. Could someone please help me to solve this issue.

PS:I have managed to set up telnet on CentOS 3.4 and FC 5 and works fine.

Thank you in-advance,
Best Regards,
A .
 
Old 05-29-2007, 08:04 AM   #2
b0uncer
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Registered: Aug 2003
Distribution: CentOS, OS X
Posts: 5,131

Rep: Reputation: Disabled
Use SSH2 instead if you can, as far as I understand it's (a lot) more secure than telnet. Especially if you ever planned to use passwords..

The error message seems to tell that the server won't allow unencrypted connections (whatever it means in this case) and that you are trying to establish an unencrypted connection, and so it fails. Solution: either make your server accept unencrypted connections too (not wise I'm afraid, or safe) or make your client connect with encryption..
 
Old 05-29-2007, 09:33 AM   #3
Azzath
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Registered: Jan 2005
Location: Russia
Distribution: Mandrake, CentOS
Posts: 138

Original Poster
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You mean to use a telnet client for windows such as putty to use SSH2/SSH? Whats the command like to telnet using SSH2 from a UNIX machine to another UNIX machine?

Thanks for your reply b0uncer.

Any more answers welcome.

Thank you in-advance,
Regards,
A.
 
Old 05-29-2007, 10:27 AM   #4
mmn357157
LQ Newbie
 
Registered: May 2007
Location: Bangalore
Distribution: RHEL
Posts: 20

Rep: Reputation: 0
run the following command and check the output

Code:
# chkconfig --list | grep telnet
if its something like this

Code:
ekrb5-telnet: on
krb5-telnet: on
telnet: on
telnetd: on
You can turn off kerbarose enabled services by

Code:
# chkconfig ekrb5-telnet off
# chkconfig krb5-telnet off
there is a conflict occures when all these services are enabled and your request will probably deny.

Also, try using SSH instead of telnet. its quiet easy to configure and use.
more at: http://www.linuxhomenetworking.com/w...d_File_Copying
 
Old 05-30-2007, 04:07 AM   #5
Azzath
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Registered: Jan 2005
Location: Russia
Distribution: Mandrake, CentOS
Posts: 138

Original Poster
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Using SSH2 I could Telnet to the Server.

@mmn357157:
Only ekrb5-telnet: on
krb5-telnet: on
was on.

Thanks Guys for all your help

Best Regards,
Azzath.
 
Old 02-20-2010, 02:08 PM   #6
tuewru
LQ Newbie
 
Registered: Feb 2010
Location: Hanoi - Vietnam
Distribution: Centos v5
Posts: 9

Rep: Reputation: 0
i have same Azzath's problem
I use Centos OS v5
I can't telnet into virtual server running Centos OS, but i can use SSH that connect to virtual server running Centos OS


I want to telnet into Centos, although SSH ok

Quote:
[root@cisco root]# chkconfig --list |grep telnet
ekrb5-telnet: off
krb5-telnet: off
telnet: on
Quote:
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-02-20 11:48 EST
Interesting ports on cisco (127.0.0.1):
Not shown: 1673 closed ports
PORT STATE SERVICE
22/tcp open ssh
23/tcp open telnet
25/tcp open smtp
111/tcp open rpcbind
631/tcp open ipp
737/tcp open unknown
742/tcp open netrcs

Quote:
# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID

Please help me
 
Old 02-20-2010, 02:53 PM   #7
bathory
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Hi,

You should start a new thread describing your problem and not a 3ys old one.
Anyways since port 23 is open from localhost, are you sure it's not a firewall problem?
 
Old 02-21-2010, 04:19 AM   #8
tuewru
LQ Newbie
 
Registered: Feb 2010
Location: Hanoi - Vietnam
Distribution: Centos v5
Posts: 9

Rep: Reputation: 0
Quote:
Originally Posted by bathory View Post
Hi,

You should start a new thread describing your problem and not a 3ys old one.
Anyways since port 23 is open from localhost, are you sure it's not a firewall problem?
thanks bathory
In Centos OS, I allowed port 23 (Telnet) in Firewall configuration option
In Windows Firewall of Window OS , it exceptions port 23
Finally :

Quote:
C:\Documents and Settings\AdminCisco>telnet 192.168.1.5
Connecting To 192.168.1.5...Could not open connection to the host, on port 23: Connect failed
192.168.1.5/24 : server Centos v5
192.168.1.200/24 : client Windows OS
 
Old 02-21-2010, 04:43 AM   #9
bathory
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Registered: Jun 2004
Location: Piraeus
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Can you try from the Centos box and see what you get?
Code:
telnet localhost
 
Old 02-21-2010, 09:37 AM   #10
tuewru
LQ Newbie
 
Registered: Feb 2010
Location: Hanoi - Vietnam
Distribution: Centos v5
Posts: 9

Rep: Reputation: 0
Quote:
Originally Posted by bathory View Post
Can you try from the Centos box and see what you get?
Code:
telnet localhost

i try to command "telnet localhost"that you suggestion and result :

Quote:
[root@cisco ~]# telnet localhost
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host: Connection refused
thanks you for support me
 
Old 02-21-2010, 09:48 AM   #11
tuewru
LQ Newbie
 
Registered: Feb 2010
Location: Hanoi - Vietnam
Distribution: Centos v5
Posts: 9

Rep: Reputation: 0
I solved my problem
I searched Google and found a URL "How to enable telnet server on Centos 5"
Code:
 http://www.lecuong.info/How-to-enable-telnet-server-on-Centos-5/
I try command
Quote:
[root@lecuong ~]# /etc/init.d/xinetd restart
and i successful
I can telnet localhost and can telnet my virtual machine running Centos 5

Thanks all people for support me
I'm very happy
 
  


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