unable to ssh from one machine to another connected to the same wireless router

adityavpratap · 11-22-2009, 03:57 AM

Hi!

I am trying to ssh between laptop1 (say 192.168.1.33, running Ubuntu 9.04) and laptop2 (192.168.1.39 running Ubuntu 9.10) both connected to the same router (192.168.1.1) wirelessly. Though I am able to ssh from laptop2 to laptop1, I am unable to do the vice-versa. Yes, openssh-server is installed and working on both the systems.

When I issue the following command from laptop 1 -

Quote:

$ ssh myname@192.168.1.39

I get the following message -

Quote:

ssh: connect to host 192.168.1.39 port 22: Connection refused

I have ufw installed on both the systems. I have added the rule -

Quote:

22 Allow Anywhere

to both. However, the connection is still being refused.

Any suggestions?

Thanking in advance,

repo · 11-22-2009, 05:30 AM

Is the ssh deamon running?
What happens if you disable the firewall?

adityavpratap · 11-22-2009, 05:49 AM

Yes, ssh is running on both. I am able to ssh from laptop2 to laptop1. Even if I disable the firewall I am unable to disconnect.

Quote:

nmap localhost -p 22

reveals the port closed.

repo · 11-22-2009, 05:51 AM

Is ssh running on port 22 ?

adityavpratap · 11-22-2009, 07:02 AM

Pardon my ignorance! but can you tell me how do I confirm whether ssh is running on Port 22 or not?

repo · 11-22-2009, 07:58 AM

Look in the configuration files
/etc/ssh/sshd_config
To see if ssh running

Code:

ps ax | grep sshd

You need to restart the deamon if you make any changes

adityavpratap · 11-22-2009, 08:46 AM

Ok! sshd is listening to port 512. I started sshd by issuing the following command -

Quote:

$sudo /usr/sbin/sshd

but now when I try

Quote:

ssh 192.168.1.39 -p 512

I get the following message -

Quote:

Connection closed by 192.168.1.39

repo · 11-22-2009, 09:14 AM

To start/stop or restart sshd

Code:

sudo /etc/init.d/ssh start/stop/restart

Look in the logfiles to see what happens, or use

Code:

ssh -vvv 192.168.1.39

adityavpratap · 11-22-2009, 09:33 AM

Ok! I restarted ssh on the target laptop and issued

Quote:

ssh -vvv 192.168.1.39

from laptop2.

Here's the output -

Quote:

OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.1.39 [192.168.1.39] port 22.
debug1: connect to address 192.168.1.39 port 22: Connection refused
ssh: connect to host 192.168.1.39 port 22: Connection refused

repo · 11-22-2009, 09:35 AM

Did you changed the conf file to listen on port 22, and restarted ssh ?

EricTRA · 11-22-2009, 09:39 AM

Hi,

If you ssh daemon on 192.168.1.39 is still listening on port 512 then you need to tell it that on the ssh command. The last one you issued is connecting on port 22 probably because you forgot to add the '-p' parameter.

Code:

ssh -vvv 192.168.1.39 -p 512

Try again with the command above and post the output.

Kind regards,

Eric

adityavpratap · 11-22-2009, 10:08 AM

Ok! There is some development! Actually there are two files in /etc/ssh - ssh_config and sshd_config. The former was listening to 22 and the later was listening to 512. So I changed the port to 22 in sshd_config.

Now ssh 192.168.1.39 gives the following output -

Quote:

OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.1.39 [192.168.1.39] port 22.
debug1: Connection established.
debug1: identity file /home/aditya/.ssh/identity type -1
debug1: identity file /home/aditya/.ssh/id_rsa type -1
debug1: identity file /home/aditya/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-6ubuntu2
debug1: match: OpenSSH_5.1p1 Debian-6ubuntu2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
Connection closed by 192.168.1.39

repo · 11-22-2009, 10:59 AM

What hapens when you connect from the computer 192.168.1.39?

Code:

ssh -vvv 127.0.0.1

adityavpratap · 11-22-2009, 11:04 AM

Yes, I tried that. But I got the same message I quoted earlier. Except for the IP address.

repo · 11-22-2009, 11:12 AM

I would suggest to copy the working sshd.conf file from the working laptop to 192.168.1.39
and restart sshd