cannot telnet port 25 from other hosts

Tobias Speckbacher TSpeckbacher at quova.com
Thu Jul 29 15:35:43 UTC 2004


wow /screams

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com]On Behalf Of M Syafii
Sent: Thursday, July 29, 2004 6:57 AM
To: General Red Hat Linux discussion list
Subject: Re: cannot telnet port 25 from other hosts


On Wed, 28 Jul 2004 14:25:03 +0000
  "ssoss S" <sctssoss at hotmail.com> wrote:
> hi..  I found that I cannot telnet my linux box (fedora 
>core1) via port 25 (SMTP) but the SMTP service is 
>started.  I can telnet to localhost via port 25.  May I 
>know where is the config to control and allow me to 
>telnet mylinux 25 from other hosts??
> 
>FYI, my sendmail version is
> [root at watcher root]# telnet localhost 25
> Trying 127.0.0.1...
> Connected to localhost.
> Escape character is '^]'.
> 220 watcher.teasin.com ESMTP Sendmail 8.12.10/8.12.10; 
>Wed, 28 Jul 2004 22:19:17
> +0800

i think you can use 3 options :

1. maybe you can try use tcpwrappers

please open /etc/hosts.allow

if you want allow computer with ip address 192.168.0.5 to 
access telnet on your host
write :

telnetd:192.168.0.5

and open too /etc/hosts.deny to set default anything 
access is restricted

write:

ALL:ALL


2. or you can use xinetd

open /etc/xinetd.d/telnetd


# default: on
# description: The telnet server serves telnet sessions; 
it uses \
#       unencrypted username/password pairs for 
authentication.
service telnet
{
         flags = REUSE
         log_on_failure += USERID
         disable = yes
         socket_type = stream
         user = root
         server = /usr/sbin/in.telnetd
         wait = no
         only_from = 192.168.0.5
}


3. or you can use iptables

#/sbin/iptables -A INPUT -p TCP -s 192.168.0.5 --dport 23 
-j ACCEPT




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