ssh tunnel // "telnet localhost tunnel_port" works, from remote host "telnet hostname tunnel_port" fails

From: Vince (vince_v_at_lycos.de)
Date: 04/22/05 

Date: 22 Apr 2005 03:18:52 -0700

Hi Guys,

I got a SUSE linux box with OpenSSh installed.
<hostname>:/proc # uname -r
2.4.21-138-smp
<hostname>:/proc # ssh -Version
OpenSSH_3.4p1, SSH protocols 1.5/2.0, OpenSSL 0x0090607f

I use "ssh <remotehost_1> -L 54321:<remotehost_2>:23 to build a ssh
tunnel for a telnet session to remotehost_2 (which can not be accessed
from my linux box directly). remotehost_2 is a HPUX box, could be
anything else too

When I use "telnet localhost 54321" on my linux box this works fine

When I use "telnet <hostname> 54321" on my linux box it fails
hprtdc14:/proc # telnet <hostname> 55555
Trying 12.23.34.45...
telnet: connect to address 12.23.34.458: Connection refused

When I use "telnet <hostname> 55555" from a remote box (windows -
could be anything else too) it fails
C:\>telnet <hostname> 55555
Connecting To <hostname>...Could not open connection to the host, on
port 55555: Connect failed
C:\>

I assume my linux box refuses connections from hosts other than
localhost. Further on I see in netstat that only 127.0.0.1 is listened
on (not on its IP)
<hostname>:/proc # netstat -an | grep 55555
tcp 0 0 127.0.0.1:55555 0.0.0.0:*
LISTEN
tcp 0 0 ::1:55555 :::*
LISTEN
<hostname>:/proc #

Compared to windows: In putty I have an option "Local ports accept
connections from other hosts"

Is there somthing similar on linux? I want to use my ssh tunnel from
other hosts than localhost.

best regards,
Vince

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