Ubuntu - Openssh

markyboy

Hi there,

I have two Ubuntu PC's connected over a LAN connection.

I've installed openssh server on both.

I can ssh into PC B from PC A but can't ssh from PC A in PC B.

It keeps exiting.

I don't have a firewall running on either PC

Any ideas? I've googled it and tried everything suggested to no avail.

Regards,
Mark,

markyboy

Thanks OSI

I appreciate your help. To answer yourquestions

OSI wrote: »

Are you using the same user to SSH from A to B as you would normally login to B with?

I login to both machines with the same username and password

OSI wrote: »

Do you have a terminal set for the user on PC B?

I created a separate account and switched to that user on PC B and it still timed out

markyboy

OSI wrote: »

What's the exact error message it gives? Or does it give a message at all?

ssh: connect to host 192.168.1.2 port 22: Connection timed out


I know already this is going to be something really easy or tortuously difficult

markyboy

OSI wrote: »

Hmmm, either OpenSSH isn't actually running or something is blocking access to the port.

On PC B what does

ps auxw | grep sshd | grep -v grep

Show?

If it doesn't show anything, try

sudo service ssh start

mark@home-desktop:/home/home$ ps auxw | grep sshd | grep -v grep
root 788 0.0 0.0 5552 2140 ? Ss 12:05 0:00 /usr/sbin/sshd -D
root 2181 0.0 0.1 8864 3056 ? Ss 12:48 0:00 sshd: home [priv]
home 2258 0.0 0.0 8864 1596 ? S 12:48 0:00 sshd: home@notty

sorry about the formatting

markyboy

OSI wrote: »

OK, so sshd is running, and the user should have a shell as you can login.

Only thing I can think of is routing or some sort of port filtering.

One more:

sudo nmap -sS -O 192.168.1.2

Not shown: 995 closed ports
PORT STATE SERVICE
21/tcp open ftp
23/tcp open telnet
53/tcp open domain
80/tcp open http
139/tcp open netbios-ssn

So port 22 isn't open?

I've switched modem's recently and now have to work out how to open ports on a Vodafone HG556a

Jonathan

Run ssh with -vvv to show verbose output.

markyboy

Jonathan wrote: »

Run ssh with -vvv to show verbose output.

here we go

debug3: packet_send2: adding 64 (len 53 padlen 11 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug3: Wrote 144 bytes for a total of 1271
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug3: Wrote 128 bytes for a total of 1399
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: Sending environment.
debug3: Ignored env ORBIT_SOCKETDIR
debug3: Ignored env GPG_AGENT_INFO
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env XDG_SESSION_COOKIE
debug3: Ignored env WINDOWID
debug3: Ignored env GNOME_KEYRING_CONTROL
debug3: Ignored env GTK_MODULES
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env DEFAULTS_PATH
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env USERNAME
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env PATH
debug3: Ignored env PWD
debug3: Ignored env GDM_KEYBOARD_LAYOUT
debug1: Sending env LANG = en_IE.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env MANDATORY_PATH
debug3: Ignored env GDM_LANG
debug3: Ignored env GDMSESSION
debug3: Ignored env HISTCONTROL
debug3: Ignored env SPEECHD_PORT
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env GNOME_DESKTOP_SESSION_ID
debug3: Ignored env LOGNAME
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env LESSOPEN
debug3: Ignored env DISPLAY
debug3: Ignored env LESSCLOSE
debug3: Ignored env XAUTHORITY
debug3: Ignored env COLORTERM
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: Wrote 448 bytes for a total of 1847
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Linux home-desktop 2.6.32-30-generic #59-Ubuntu SMP Tue Mar 1 21:30:21 UTC 2011 i686 GNU/Linux
Ubuntu 10.04.2 LTS

Welcome to Ubuntu!
* Documentation: https://help.ubuntu.com/

Last login: Fri Apr 22 11:02:51 2011 from localhost

Jonathan

I thought you said you couldn't log in?

markyboy

Apologies. Ran it on the wrong machine.

This is thresult of trying to connect from PC B to PC A

home@home-desktop:~$ ssh -vvv user@192.168.1.1
OpenSSH_5.3p1 Debian-3ubuntu6, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.1.1 [192.168.1.1] port 22.
debug1: connect to address 192.168.1.1 port 22: Connection refused
ssh: connect to host 192.168.1.1 port 22: Connection refused

markyboy

Re-booted both PC's and un-installed and re-installed everything. It's working now.

Thank you both for your help, time and patience. I really appreciate it.

Mark.

croo

I don't setup systems so often, but I think I usually need to add a new system's address to the /etc/hosts.allow on a new installation so I can ssh into it from my other boxes.

I think it is also recommended to set /etc/hosts.deny to ALL:ALL