ssh in network

Sun Apr 1 16:18:14 MST 2012

Now, instead of the 'no route to host' error I get a 'connection refused'.
I still can't ssh to the ubuntu machine. it times out.

On Sun, Apr 1, 2012 at 4:08 PM, Lisa Kachold <lisakachold at obnosis.com>wrote:

> <snip>
>
> I was googling the 'no route to host' and found a suggestion to add a
>> route that poimts to the routerr with the command 'sudo ip route add
>> 192.168.1.0/24 dev eth0'. So I thought that sounded good  but after I
>> did not only could I not ssh out of the computer but I could no longer ssh
>> into the computer. I then tried to remove the route with the command 'sudo
>> ip route del 192.168.1.0/24 dev eth0', but that didn't help any. I just
>> realized that the ip address is wrong.... my router is 192.168.0.1 but:
>>
>>   sudo ip route add 192.168.0.1/24 dev eth0
>>   RTNETLINK answers: Invalid argument
>>
>
> A route add command is not persistent past a reboot or network restart.
>
> Mike, ONE of your systems is on your Wireless and the other is on the
> wired?  Sometimes wireless to wired connections take longer than the
> timeout values for ssh or scp.  Try putting them both on either wireless or
> wired and see if that's more successful?
>
> Timeouts could be why you get a no route to host.
>
> Verify that both boxes have a default route:
>
> # sudo netstat -rn
>
> Verify that both boxes have a listening ssh daemon:
>
> # sudo netstat -antp | grep 22
>
> Make sure you haven't installed DenyHosts or iptables that limits your
> connections:
>
> # locate Deny |more
> # sudo iptables-save |more
>
> If you don't understand the output post it to the list.
>
>>
>> # apt-get install openssh-server
>>>
>>
>> sudo apt-get install openssh-server
>> . . .
>> openssh-server is already the newest version.
>> openssh-server set to manually installed.
>>
>>
>>> You run a ssh server and you use a ssh client as a user.
>>>
>>> # ssh myusername at targetserverIP
>>>
>>>>
>>>>> # grep Root /etc/ssh/sshd_config <--------------- 'root' not in file
>>>>>
>>>>
>>> Make sure you used "Root" like
>>> # sudo grep Root /etc/ssh/sshd_config
>>>
>>
>> there it is..... PermitRootLogin yes
>>
>
> Good! You can ssh to this host with root.
>
>>
>>  If the connection is seen on the host (but has some problem due to FQN
>>>>> (/etc/hosts) or /etc/hosts.allow files, it will be logged in either:
>>>>>
>>>> Hmmm?  Go look in var log and see what this system logs to:
>>>
>>> # sudo tail /var/log/syslog
>>>
>>>>
>>>>> bmike1 at Michaels-PC:~$ sudo tail /var/log/messages;sudo tail
>> /var/log/syslog
>> tail: cannot open `/var/log/messages' for reading: No such file or
>> directory
>> Apr  1 13:09:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:14:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:17:01 Michaels-PC CRON[8219]: (root) CMD (   cd / && run-parts
>> --report /etc/cron.hourly)
>> Apr  1 13:19:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:24:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:29:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:34:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:39:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:44:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> Apr  1 13:49:46 Michaels-PC ddclient[1763]: WARNING:  file
>> /etc/ddclient.conf, line 8: Invalid Value for keyword 'login' = ''
>> bmike1 at Michaels-PC:~$
>>
>
> What - are you running ddclient for?
> If you can't properly resolve DNS, you will not be able to ssh:
>
> Please see this link regarding your ddclient errors:
>
> http://www.linuxquestions.org/questions/linux-wireless-networking-41/wifi-connects-but-no-network-access-but-wired-works-880213/
>
>>
>>
>>>  Add this to /etc/hosts.allow:
>>>>>
>>>>>   /etc/hosts.allow looks:
>>>>>
>>>>> ALL : 127.0.0.1
>>>>> sshd : 192.168.0.0/24, 78.207.132.32
>>>>>
>>>>> This example shows an external address you might want to use to
>>>>> connect from outside your internal network (once you open or port forward
>>>>> port 22).
>>>>>
>>>>> This is the hosts.allow file that I added. Does this look right?
>>
>> ALL : 127.0.0.1
>> sshd : 192.168.0.0/24, 192.168.0.1/24, 192.168.0.2/24, 192.168.0.3/24,
>> 192.168.$ <this goes on to x.y.z.10/24>
>> #shows address to use from outside of network#, 78.207.132.32
>>
>
> No, you need that 78.207.132.32 on the SAME line with either ALL or sshd:
> or commented out.
>
> And 192.168.$ might cause problems.  Change it to a safe entry:
> ############cut here############
> ALL : 127.0.0.1
> sshd : 192.168.0.0/16, 78.207.132.32 <http://192.168.0.0/24>
> ###########end ###############
>
> Make sure you did this:
>
>>   Now the /etc/hosts.deny file:
>>>>>
>>>>> ALL : ALL
>>>>>
>>>>>
>>>>
>>>> Do this and your apt-get/aptitude will be fixed:
>>>
>>> # sudo apt-get install make
>>>
>>>
>>>
>> make is already its current version
>>
>
> # sudo apt-get update
>
> Also setup your /etc/hosts file on both servers following these
> suggestions:
> http://linux.about.com/od/commands/l/blcmdl5_hosts.htm
>
> Should look like this (except with all your hostnames on your network - be
> sure to put the same one on all your linux boxes):
>
>  127.0.0.1       localhost
>  192.168.1.10    foo.mydomain.org       foo
>  192.168.1.13    bar.mydomain.org       bar
>
>
>
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-- 
:-)~MIKE~(-:
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