Can't connect via ssh

I have 4 computers, all connected to a Fritz router. On three of them
SuSE 10.1 is installed.

Recently I upgraded one of them to SuSE 11.2. But now, this computer is
no more reachable by ssh from the other ones. Any attempt to connect to
it via ssh produces the answer:

"ssh: connect to host <name> port 22: Connection refused"

How can I open it to ssh access from the other computers?

Thank you in advance for your help,
Wolfgang

Hello,

Wolfgang a écrit :
>
> Recently I upgraded one of them to SuSE 11.2. But now, this computer is
> no more reachable by ssh from the other ones. Any attempt to connect to
> it via ssh produces the answer:
>
> "ssh: connect to host <name> port 22: Connection refused"

Check that
- sshd is running (ps aux)
- it has a socket listening on port 22 (netstat -tnlp)
- iptables rules allow TCP connections to port 22 (iptables-save)

Pascal Hambourg wrote:
> Hello,
>
> Wolfgang a écrit :
>> Recently I upgraded one of them to SuSE 11.2. But now, this
>> computer is no more reachable by ssh from the other ones.
>> Any attempt to connect to it via ssh produces the answer:
>>
>> "ssh: connect to host <name> port 22: Connection refused"
>
> Check that
> - sshd is running (ps aux)
> - it has a socket listening on port 22 (netstat -tnlp)
> - iptables rules allow TCP connections to port 22 (iptables-save)

Thanks a lot! Your first guess hit the problem.
Having started sshd, I can connect to the computer
from any other site of my network.

Now I have put links to sshd in /etc/init.d/rc[35].d
for making it start at boot time.

Merci bien ancore une fois,
Wolfgang

Pascal Hambourg wrote:

> Check that
> - sshd is running (ps aux)
> - it has a socket listening on port 22 (netstat -tnlp)
> - iptables rules allow TCP connections to port 22 (iptables-save)

And /etc/host.allow & /etc/host.deny

--
Lord Eldritch

Lord Eldritch a écrit :
> Pascal Hambourg wrote:
>
>> Check that
>> - sshd is running (ps aux)
>> - it has a socket listening on port 22 (netstat -tnlp)
>> - iptables rules allow TCP connections to port 22 (iptables-save)
>
> And /etc/host.allow & /etc/host.deny

s/host/hosts/

I wonder, would that cause a "connection refused" at TCP level ?
AFAICS, the TCP connection is established and closed after a short
delay, without any communication with the service.

Wolfgang wrote:

> I have 4 computers, all connected to a Fritz router. On three of them
> SuSE 10.1 is installed.
>
> Recently I upgraded one of them to SuSE 11.2. But now, this computer
> is no more reachable by ssh from the other ones. Any attempt to
> connect to it via ssh produces the answer:
>
> "ssh: connect to host <name> port 22: Connection refused"
>
> How can I open it to ssh access from the other computers?
>
> Thank you in advance for your help,
> Wolfgang

If only the one system was changed and it worked before, then on that
system check your firewalls (iptables) and that it allows incoming over
your SSH port (I assume it's using the default port of 22), at least
allowing access for the source IPs of the other systems, check that ssh
itself is running, check /etc/hosts.{allow,deny} files, the SSH config
settings, and above all, check the logs on the system to see what it
says about rejecting it.
--
Not really a wanna-be, but I don't know everything.

Pascal Hambourg wrote:

> Lord Eldritch a écrit :

>> And /etc/host.allow & /etc/host.deny
>
> s/host/hosts/
>
My fault. That happens when you write without thinking too much.

> I wonder, would that cause a "connection refused" at TCP level ?
> AFAICS, the TCP connection is established and closed after a short
> delay, without any communication with the service.
>
Again, I didn't think to much about it, just the files that came to mind
when I find connection problems.
--
Lord Eldritch