Same happened to me yesterday.
Allowing SSH access to ESXi/ESX hosts with public/private key authentication (1002866)
is of no help because this no longer works.
It looks as if though your 'authorized_keys' file could not be found.
After searching around a bit ( admittedly a quite long bit) , I found out the cause and the solution.
In this file '/var/log/auth.log' there are entries that show this
Seems that this is a hint.userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Following that, I quite quickly got the impressions that this update has changes to SSH in it.
Apparently it includes a new version of SSH.
To verify this: let's try:
So OK, that is a new version.ssh -VOpenSSH_7.1p1, OpenSSL 1.0.1p 9 Jul 2015
Further following this road gets me here:
So OK, let's go there: http://www.openssh.com/legacy.html* Support for ssh-dss, ssh-dss-cert-* host and user keys is disabled by default at run-time. These may be re-enabled using the instructions at http://www.openssh.com/legacy.html
Here I read:
OpenSSH 7.0 and greater similarly disables the ssh-dss (DSA) public key algorithm. It too is weak and we recommend against its use. It can be re-enabled using the HostkeyAlgorithms configuration option:ssh -oHostKeyAlgorithms=+ssh-dss firstname.lastname@example.org
or in the ~/.ssh/config file:Host somehost.example.org HostkeyAlgorithms ssh-dss
So OK, but how do I enable it?
Lets see. Clearly we need to edit the file '/etc/ssh/sshd_config'.
So after having created a backup of this file (and having me ending up locked out several times), I added two and tow together and tried this:
Here I added the line
HostkeyAlgorithms ssh-dssThen restart the SSH daemon
But. It still doesn't work./etc/init.d/SSH restart
OK, but I still think this is the right way to go.
Restore the backuped file.
So we add two and three together which looks like this:
Now I add the linevi /etc/ssh/sshd_config
PubkeyAcceptedKeyTypes ssh-dssThen again:
Et voilà. It works.
So all you have to do is add the line
PubkeyAcceptedKeyTypes ssh-dssto the file ' /etc/ssh/sshd_config' and then restart the SSH daemon using
/etc/init.d/SSH restartThat's it.