01-24-2018
Hi,
Happy New Year to you too ! Firstly, your atetmpt to run sshd at the server-side in debugging mode failed because there was already an instance of sshd listening on port 22, so no new instance could start. To caputre debugging output you'd have to stop the SSH daemon on the server, then run the debugging instance manually again. That would then be able to bind to port 22 and capture debugging info for your incoming session, which might shed more light on things.
Regarding the actual error itself, it would seem to imply that as you suspect something has gone wrong with the key you're trying to use for authentication. Either the key you're using isn't in the authorized_keys file at the server side for the account you're attempting to log in to, or there's something wrong with its entry if it is. Alternatively, there could also be a problem with the permissions on the authorized_keys file, or with the .ssh directory or its parent.
But hopefully actually getting to capture the debugging data will help you figure out what exactly has gone wrong here. You can also get more debugging info from the client side too, by running your SSH command with the -v flag, e.g. ssh -v -v -v user@server.
Hope this helps.
Last edited by drysdalk; 01-24-2018 at 08:32 AM..
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LEARN ABOUT REDHAT
ssh-keysign
SSH-KEYSIGN(8) BSD System Manager's Manual SSH-KEYSIGN(8)
NAME
ssh-keysign -- ssh helper program for hostbased authentication
SYNOPSIS
ssh-keysign
DESCRIPTION
ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during hostbased authentication with
SSH protocol version 2.
ssh-keysign is disabled by default and can only be enabled in the the global client configuration file /etc/ssh/ssh_config by setting
HostbasedAuthentication to ``yes''.
ssh-keysign is not intended to be invoked by the user, but from ssh(1). See ssh(1) and sshd(8) for more information about hostbased authen-
tication.
FILES
/etc/ssh/ssh_config
Controls whether ssh-keysign is enabled.
/etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
These files contain the private parts of the host keys used to generate the digital signature. They should be owned by root, read-
able only by root, and not accessible to others. Since they are readable only by root, ssh-keysign must be set-uid root if hostbased
authentication is used.
SEE ALSO
ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)
AUTHORS
Markus Friedl <markus@openbsd.org>
HISTORY
ssh-keysign first appeared in OpenBSD 3.2.
BSD
May 24, 2002 BSD