How to Secure the SSH Server in Ubuntu 20.04 from Basic to Advanced

Method of Securing the SSH Server in Ubuntu 20.04:

1. sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak.
2. sudo sshd –T.
3. sudo nano /etc/ssh/sshd_config.
4. sudo sshd –t.
5. sudo service sshd reload.
6. sudo nano ~/.ssh/authorized_keys.

1. How do I make ssh more secure?
2. How do I secure and harden my openssh server?
3. How do I harden SSH in Ubuntu?
4. How can I make my Linux server more secure?
5. Is SSH a security risk?
6. Is it safe to forward ssh port?
7. How do I harden SSH?
8. How do I harden Ubuntu?
9. What security functions are enforced SSH?
10. How do I SSH into a Ubuntu server?
11. How do I know if my Linux server is hardening?
12. How do you secure your server?
13. What is the most secure version of Linux?

How do I make ssh more secure?

10 Steps to Secure Open SSH

1. Strong Usernames and Passwords. ...
2. Configure Idle Timeout Interval. ...
3. Disable Empty Passwords. ...
4. Limit Users' SSH Access. ...
5. Only Use SSH Protocol 2. ...
6. Allow Only Specific Clients. ...
7. Enable Two-Factor Authentication. ...
8. Use Public/Private Keys for Authentication.

How do I secure and harden my openssh server?

How to Secure and Harden OpenSSH Server

1. Setup SSH Passwordless Authentication. By default, SSH requires users to provide their passwords when logging in. ...
2. Disable User SSH Passwordless Connection Requests. ...
3. Disable SSH Root Logins. ...
4. Use SSH Protocol 2. ...
5. Set SSH Connection Timeout Idle Value. ...
6. Limit SSH Access to Certain Users. ...
7. Configure a Limit for Password Attempts.

How do I harden SSH in Ubuntu?

Secure the SSH server on Ubuntu

1. Change the default SSH port.
2. Use SSH2.
3. Use a whitelist and a blacklist to limit user access.
4. Disable root login.
5. Hide last login.
6. Restrict SSH logins to specific IP addresses.
7. Disable password authentication.
8. Disable .rhosts.

How can I make my Linux server more secure?

10 Security Best Practices for Linux Servers

1. Use Strong and Unique Passwords. ...
2. Generate an SSH Key Pair. ...
3. Update Your Software Regularly. ...
4. Enable Automatic Updates. ...
5. Avoid Unnecessary Software. ...
6. Disable Booting from External Devices. ...
7. Close Hidden Open Ports. ...
8. Scan Log Files with Fail2ban.

Is SSH a security risk?

As I discussed before, SSH is a powerful security tool, protecting privileged access to mission critical systems. However, when it is not properly managed, it can become a security liability instead of asset. ... As you can see, the risks span the SSH server and client, with most arising on the server-side.

Is it safe to forward ssh port?

SSH port forwarding is not dangerous by itself, however, its safety depends on the service at the target port. Some have suggested that the safety of port forwarding is dependent on how strong your firewall is and its level of internal and external protection.

How do I harden SSH?

15 Best SSH Hardening Tips

1. Set a custom SSH port.
2. Use TCP Wrappers.
3. Filter the SSH port on your firewall.
4. Disable Root Login.
5. SSH Passwordless Login.
6. Strong passwords/passphrase for ssh users and keys.
7. Set Idle Timeout Interval.
8. Disable Empty Passwords.

How do I harden Ubuntu?

The following tips and tricks are some easy ways to quickly harden an Ubuntu server.

1. Keep System Up-To-Date. ...
2. Accounts. ...
3. Ensure Only root Has UID of 0. ...
4. Check for Accounts with Empty Passwords. ...
5. Lock Accounts. ...
6. Adding New User Accounts. ...
7. Sudo Configuration. ...
8. IpTables.

What security functions are enforced SSH?

Overview of SSH Key Security Authentication

• Logging into remote computers/servers for support and maintenance.
• Transferring of files from computer to computer.
• Remote execution of commands.
• Offering support and updates.

How do I SSH into a Ubuntu server?

Enabling SSH on Ubuntu

1. Open your terminal either by using the Ctrl+Alt+T keyboard shortcut or by clicking on the terminal icon and install the openssh-server package by typing: sudo apt update sudo apt install openssh-server. ...
2. Once the installation is completed, the SSH service will start automatically.

How do I know if my Linux server is hardening?

You can view current status of SELinux mode from the command line using 'system-config-selinux', 'getenforce' or 'sestatus' commands. If it is disabled, enable SELinux using the following command. It also can be managed from '/etc/selinux/config' file, where you can enable or disable it.

How do you secure your server?

Secure Server Connectivity

1. Establish and Use a Secure Connection. ...
2. Use SSH Keys Authentication. ...
3. Secure File Transfer Protocol. ...
4. Secure Sockets Layer Certificates. ...
5. Use Private Networks and VPNs. ...
6. Monitor Login Attempts. ...
7. Manage Users. ...
8. Establish Password Requirements.

What is the most secure version of Linux?

Most secure Linux distros

• Qubes OS. Qubes OS uses Bare Metal, hypervisor type 1, Xen. ...
• Tails (The Amnesic Incognito Live System): Tails is a live Debian based Linux distribution considered among the most secure distributions together with the previously mentioned QubeOS. ...
• Alpine Linux. ...
• IprediaOS. ...
• Whonix.