Fedora 30
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OpenSSH : Password Authentication2019/05/06

Configure SSH Server to login to a server from remote computer.
[1] OpenSSH is already installed by default even if you installed Fedora with [Minimal Install], so it's not necessarry to install new packages. You can login with Password Authentication by default, but change some settings for security like follows.
[root@dlp ~]#
vi /etc/ssh/sshd_config
# line 46: change ( prohibit root login remotely )

[root@dlp ~]#
systemctl restart sshd

[2] If Firewalld is running, allow SSH service. SSH uses 22/TCP.
[root@dlp ~]#
firewall-cmd --add-service=ssh --permanent

[root@dlp ~]#
firewall-cmd --reload

SSH Client : Fedora
Configure SSH Client for Fedora.
[3] Install SSH Client.
[root@client ~]#
dnf -y install openssh-clients
[4] Connect to SSH server with a common user.
# ssh [username@(hostname or IP address)]

[root@client ~]#
ssh fedora@dlp.srv.world

The authenticity of host 'dlp.srv.world (' can't be established.
ECDSA key fingerprint is SHA256:MlsFiyeCPK2YKIuM1Jhsjorw0h4EummutkZyTKWib7Q.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'dlp.srv.world,' (ECDSA) to the list of known hosts.
fedora@dlp.srv.world's password:
Web console: https://dlp.srv.world:9090/ or
[fedora@dlp ~]$   # just logined
[5] It's possbile to execute commands on remote Host with SSH like follows.
# for example, run [cat /etc/passwd]

[cent@client ~]$
ssh fedora@dlp.srv.world "cat /etc/passwd"

fedora@dlp.srv.world's password:
SSH Client : Windows #1
Configure SSH Client on Windows.
[6] Get a software which you can login with SSH from Windows clients. This example shows to use Putty. Install and start it and input your server's IP address and Click [Open] button like follows.
[7] After successing authentication, it's possible to login like follows.
SSH Client : Windows #2
[8] If your Windows is Windows 10 Version 1803 or later, OpenSSH Client has been implemented as a Windows feature, so it's possible to use ssh command on command prompt without Putty and other SSH software.
[9] It's the same usage because it's the OpenSSH Client, refer to [3], [4] section.
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