[sf-lug] request for help re ssh -- sshd login failure

[jim]

On 02/06/2016 08:27 PM, jim wrote:
> Problem : we cannot use ssh to log in on a newly installed
> Ubuntu host.
>     SEE EARLIER MESSAGE FOR DETAILS
>     sent 20160206:20:27

> I've been successfullying installing server-oriented
> Linux systems since about 2006. My behavior today is
> no different from my behavior then, but in the last
> year I've not been able to get host software on Ubuntu
> systems to work with internet connectivity.
>
> I wonder about recent changes in the OS:
> * systemd
> * IPv6 (thanks for the tip about this, Bobbie)
>
> There may be other improvements to Linux networking
> of which I'm not aware.
>
> I believe that sshd sees inbound traffic on TCP port 22
> and passes initial session requests to the  login  program,
> which does its thing and returns True or False to  sshd
> which either launches whatever shell program is specified
> in the seventh field of the users passwd record  OR  passes
> an error message from login to the user and terminates the
> connection (allowing multiple tries based on a directive
> in /etc/ssh/sshe_config ). Is that correct??
>
> Michael suggests booting from a live CD to see if the host
> behavior is the same or different. We'll do so and report.
>
> We're also considering wiping the host drive and installing
> some other OS such as an Ubuntu server-specific build,
> should there be such, or an older Ubuntu server, or a
> RedHat type OS such as Scientific Linux.
> Should we do this successfully, we'll then be wondering
> about config files and drivers and kernel versions and
> libraries.


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