Can't SSH/Putty into Debian server

rushinblue · 10-31-2007, 02:57 PM

Hi all, I just switched from FC6 to Debian and I can no longer putty (ssh) in to the server.

I get the following error message when I attempt to open it.

[PuTTY Fatal Error]-Title
Network error: Connection refused

Is there a firewall restriction within debian that by default blocks this connection?

Note: I am trying to SSH to the debian box from the same lan/subnet.

Thanks

blane · 10-31-2007, 03:07 PM

Is sshd running on the debian machine?

rushinblue · 10-31-2007, 03:11 PM

Still pretty new to Linux, how do I check that?

farslayer · 10-31-2007, 03:17 PM

Is it even installed ? By default Debian does NOT install the ssh server if you start with just a base install of the OS.

Code:

username@it-etch:~$ apt-cache policy openssh-server
openssh-server:
  Installed: 1:4.3p2-9
  Candidate: 1:4.3p2-9
  Version table:
 *** 1:4.3p2-9 0
        500 http://ftp.uwsg.indiana.edu etch/main Packages
        100 /var/lib/dpkg/status

to see if it's running

Code:

it-etch:~# netstat -nlp | grep ::22
tcp6       0      0 :::22                   :::*                    LISTEN     29489/sshd
it-etch:~#

This is actually one of the reasons I like Debian, it doesn't assume I want all sorts of services running by default. I have to Specifically install and configure what I want to run.

rushinblue · 10-31-2007, 03:18 PM

probably not. i did a basic install b/c some of the other components kept failing (web, desktop, etc)

farslayer · 10-31-2007, 03:21 PM

aptitude update
aptitude keep-all
aptitude install openssh-server

you should be good to go !!

rushinblue · 10-31-2007, 03:24 PM

Thanks, that was it!!! It wasn't installed.
----
How do you know what the package name is?

For instance, if I would have thought it wasn't installed. I would have entered 'apt-get install ssh' or 'apt-get install sshd'

Thanks

Winter Knight · 10-31-2007, 03:25 PM

Quote:

Originally Posted by rushinblue

Is there a firewall restriction within debian that by default blocks this connection?

No. If you want a firewall, you can install and configure iptables, but it is not usually necessary.

To install and run the openssh-server, run the following as root:
aptitude install openssh-server

It will set up to start automatically at boot.

farslayer · 10-31-2007, 03:31 PM

Well since Debian etch they recommend you use Aptitude instead of apt-get and don't switch back and forth.. (just fyi)

to locate the package a quick search will find the name for you ..

aptitude search ssh - Searches package names
or
aptitude search -d ssh - Searches package descriptions

Code:

it-etch:~# aptitude search ssh
p   aolserver4-nssha1                            - AOLserver4 module: performs SHA1 hashes
p   autossh                                      - Automatically restart SSH sessions and tunnels
p   clusterssh                                   - administer multiple ssh or rsh shells simultaneously
p   crosshurd                                    - Install a Debian system
p   dpsyco-ssh                                   - Automate administration of access via ssh
p   kdessh                                       - ssh frontend for KDE
p   libnet-ssh-perl                              - Perl extension for secure shell
v   libnet-ssh-ruby                              -
p   libnet-ssh-ruby1.8                           - pure ruby module that emulates an SSH client
p   libpam-ssh                                   - enable SSO behavior for ssh and pam
i   openssh-client                               - Secure shell client, an rlogin/rsh/rcp replacement
i A openssh-server                               - Secure shell server, an rshd replacement

i = installed
v = virtual package
p = No trace of the package is on your system
c = The package was deleted but the config files remain on the system.

Debian Aptitude how-to

rushinblue · 10-31-2007, 03:34 PM

Cool, OK, so I need to start using aptitude from now on.

Thanks again everyone for your help!!!