Ubuntu 26.04
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OpenSSH : Password Authentication2026/04/24
 

Configure SSH Server to manage a server from the remote computer. SSH uses 22/TCP.

[1] Password Authentication for OpenSSH Server on Ubuntu is enabled by default, so it's possible to login without changing any settings. Furthermore, root account is prohibited Password Authentication by default with [PermitRootLogin prohibit-password], so default setting is good for use. But if you prohibit root login all, change like follows.
root@dlp:~#
apt -y install openssh-server
root@dlp:~#
vi /etc/ssh/sshd_config
# line 54 : uncomment and change to [no]

PermitRootLogin
no
root@dlp:~#
systemctl restart ssh

[2] If UFW is enabled, allow SSH service. SSH uses [22/TCP].
root@dlp:~#
ufw allow ssh

Rule added
Rule added (v6)

SSH Client : Ubuntu
 

Configure SSH Client for Ubuntu.

[3] Install SSH Client.
root@client:~#
apt -y install openssh-client
[4] Connect to the SSH server with a common user.
# ssh [username@hostname or IP address]

root@client:~#
ssh ubuntu@dlp.srv.world 

The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ED25519 key fingerprint is: SHA256:IVyoxi4scRBpsoAV/lqnusuP8JQMIBOHYqM/RVdkvVM
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'dlp.srv.world' (ED25519) to the list of known hosts.
ubuntu@dlp.srv.world's password:
Welcome to Ubuntu 26.04 LTS (GNU/Linux 7.0.0-14-generic x86_64)
.....
.....
ubuntu@dlp:~$    
# just logined
[5] It's possible to execute commands on remote Host with adding commands to ssh command.
# for example, open [/etc/passwd] on remote host

ubuntu@client:~$
ssh ubuntu@dlp.srv.world "cat /etc/passwd"

ubuntu@dlp.srv.world's password:
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
.....
.....

SSH Client : Windows#1
 

Configure SSH Client for Windows.

[6]

Get a SSH Client for Windows. This example shows to use Putty like follows.

Input your server's IP address and Click [Open] button.
[7] After authentication on SSH server, it's possible to login remotely with SSH.

SSH Client : Windows #2
[8] OpenSSH Client has been implemented as an Windows feature, so it's possible to use ssh command on PowerShell or Command Prompt without Putty and other SSH software.
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