ssh required password after reinstall operation system

July 3, 2016 961 views
Security Linux Commands IPv6 Ubuntu 16.04

I reinstall OS from ubuntu 14.04 lts to linux mint 18.
After I generated new ssh-key:
$ ssh-keygen -t rsa

After I posted my new ssh key to settings account.
When I try to conncet

$ ssh root@n.n.n.n
it shows an error - http://pastebin.com/zj0SH6i6
My sshconfig - http://pastebin.com/2rmqTBim

After I added dsa ssh-key:
$ ssh-keygen -t dsa

And it printed me similar error.

2 comments
  • If I run:
    sudo ssh -v -l root serveripaddress

    It printed:
    OpenSSH7.2p2 Ubuntu-4ubuntu1, OpenSSL 1.0.2g-fips 1 Mar 2016
    debug1: Reading configuration data /etc/ssh/ssh
    config
    debug1: /etc/ssh/ssh_config line 19: Applying options for *
    ssh: Could not resolve hostname serveripaddress: Name or service not known

    If I run:
    sudo ssh -v -l anboo serveripaddress

    It printed:
    OpenSSH7.2p2 Ubuntu-4ubuntu1, OpenSSL 1.0.2g-fips 1 Mar 2016
    debug1: Reading configuration data /etc/ssh/ssh
    config
    debug1: /etc/ssh/ssh_config line 19: Applying options for *
    ssh: Could not resolve hostname serveripaddress: Name or service not known

  • Anboo,

    A few questions: did you add your public key, or keys for that matter, to your root user's authorized_keys file? Does your user, server-end, have proper permissions setup on your .ssh/ folder? Have you restart your ssh service via the command "service ssh restart," or a reboot? Your client is clearly, lines 104 and 110, trying to use the keys you made; and then failing on lines 108 and 114.

    By the way, you public IP address , and ssh port, is pretty visible in your debug file.

1 Answer

This question was answered by @MichaelOjeda:

Anboo,

A few questions: did you add your public key, or keys for that matter, to your root user's authorized_keys file? Does your user, server-end, have proper permissions setup on your .ssh/ folder? Have you restart your ssh service via the command "service ssh restart," or a reboot? Your client is clearly, lines 104 and 110, trying to use the keys you made; and then failing on lines 108 and 114.

By the way, you public IP address , and ssh port, is pretty visible in your debug file.

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