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Full Discussion: Ssh public/private key user login problem
Top Forums UNIX for Advanced & Expert Users Ssh public/private key user login problem Post 303029841 by stomp on Friday 1st of February 2019 05:39:33 PM
Old 02-01-2019
When you make sure you can login on the sshd port 2200 instance as fallback, you may play with the sshd on port 22 and possibly break it.

Just make sure that no changes are persistent. For example, use a different config file as a playground for your tests.

If it's an option to reboot, write a watchdog script that reboots the server with restored config - which happens automatically (e. g. if a certain file is older than x minutes)

Quote:
I put sshd into debug mode on server f on
Did you go down to debug2/debug3 loglevel?

...and running sessions are not terminated on sshd restarts. Just make sure some date flows back and forth, so it does not go stale and is terminated at the configured limits.But if you get in trouble, if you loose your ssh connection is away better be very very careful.

--- Post updated at 11:38 PM ---
And make sure your fallback sshd is not running in foreground and is connected to your ssh-session. Running the fallback sshd in a screen session is one better option.
Last edited by stomp; 02-04-2019 at 06:12 AM..
 

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LEARN ABOUT OPENDARWIN

sftp-server

sftp-server(1M)                                           System Administration Commands                                           sftp-server(1M)

NAME

       sftp-server - SFTP server subsystem

SYNOPSIS

       /usr/lib/ssh/sftp-server

DESCRIPTION

       sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer.

       sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings.

       To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config:

       Subsystem   sftp     /usr/lib/ssh/sftp-server

       See sshd_config(4) for a description of the format and contents of that file.

       There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd.

EXIT STATUS

       The following exit values are returned:

       0        Successful completion.

       >0       An error occurred.

FILES

       /usr/lib/sftp-server

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWsshdu                    |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5)

       To  view  license  terms,  attribution,  and  copyright  for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the
       Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed
       location.

AUTHOR

       Markus Friedl

SunOS 5.10                                                          30 Jul 2003                                                    sftp-server(1M)
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