📦 Installation Command
apt install openssh-server
SSH Default Port & Security Configuration
openssh-server systemctl: sshSSH server with built-in SFTP support. Most secure file transfer method.
🔌 Default Port
22
tcp
SSH/SFTP
⚙️ Configuration Files
/etc/ssh/sshd_config/etc/ssh/sshd_config.d/~/.ssh/authorized_keys
📂 Default Directories
- config:
/etc/ssh - data:
User home directories - logs:
/var/log/auth.log - host_keys:
/etc/ssh/ssh_host_*
🔐 Default Credentials
Username:N/A (system users)
Password:N/A (system passwords or keys)
💡 Uses system auth. Prefer SSH keys over passwords.
⚠️ Conflicts
✅ Works With
🛡️ Security Notes
Disable root login, use SSH keys, change default port, enable fail2ban, use AllowUsers/AllowGroups, disable password auth if possible
❓ Frequently Asked Questions
What is SSH default port?
SSH uses port 22 by default.
How to change SSH port?
Edit /etc/ssh/sshd_config, change 'Port 22' to your port, then restart sshd.
How to secure SSH?
Disable root login, use key authentication, change default port, install fail2ban.