Ubuntu 12.4 LTS ssh access

kohshan99 · 09-16-2016, 01:55 AM

using ubuntu 12.04 LTS x86_64. i can ping this system but can't access via ssh. sometime it show me to enter user name when i put username like 'root' then enter passwd. after nothing..

and it will be ok after restarting this system (sorry_for_bad_english)
screenshot attached.

Turbocapitalist · 09-16-2016, 03:39 AM

I can't recall what the default settings are for Ubuntu 12.04, but for quite some time root login over SSH has been prohibited by default. So with that in mind, what happens when you try logging in as a normal user?

Other things to try would be connecting using more verbosity on the client.

Code:

ssh -v kohshan99@server.example.com
ssh -vv kohshan99@server.example.com
ssh -vvv kohshan99@server.example.com

The messages there might give an indication of what is going wrong. Alternately, if you have console access to the server you might look in the log file /var/log/auth to see what the SSH server says is happening.

kohshan99 · 09-16-2016, 04:11 AM

well... its not just a ssh problem. actually em streaming live channels from this server. channels also not working in this situation. i have to restart this machine to get channels back on live and other stuff like ssh.

Turbocapitalist · 09-16-2016, 04:22 AM

Ok. It sounds more like a networking problem if several services are affected. Can you make the problem occur on demand? Can you monitor the system log file and see if anything useful comes up when the problem occurs? Open a terminal window and run "tail" to monitor the log live.

Code:

tail -f /var/log/syslog

That will show a live feed of the latest entries.
The log file is readable to any account that is a member of the adm group.

Habitual · 09-16-2016, 05:08 AM

Threre's a root account on Ubuntu 12.04?
I thought root login was disabled by Ubuntu.

Turbocapitalist · 09-16-2016, 05:10 AM

Quote:

Originally Posted by Habitual

Threre's a root account on Ubuntu 12.04?
I thought root login was disabled by Ubuntu.

Some enable it. It's not recommended though and I would also discourage it and prefer adjusting sudoers properly.

kohshan99 · 09-16-2016, 07:18 AM

and when i connect it to lcd, there is noting but black screen even keyboard won't work. i've to unplug power cable then put it back after that everything working..

Turbocapitalist · 09-16-2016, 08:05 AM

Ok. When it happens, can you make note of the time and then use "less" to check the logs to see what happens at that time?

Code:

less /var/log/syslog

Also, is there any way for you to make the problem happen on purpose?

kohshan99 · 09-19-2016, 01:14 AM

seems there is problem with hardware. coz whenever i press function(i.e F2) key for go to server bios, server got freez on recovery screen and then i have to unplug power cable remove hard disk and connect with another system to press enter for normal boot. i already installed different version of ubuntu os. i was searching in syslogs for any abnormal activity but there is nothing spacial..