SSH (Secure Shell) is an encrypted protocol that is way more secure than Plain text based protocols like Telnet, however, it’s could be vulnerable if not configured properly.
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We are assuming that you have root permission, otherwise, you may start commands with “sudo”.
We are going to provide 4 simple tips to get a more secure SSH protocol on your Ubuntu server.
Generate the license. After running this command, a file called iourc.txt will be created. Copy and paste the license key in the file to the Preference IOS on UNIX section of GNS3. IOS on UNIX section. Finally, everything is green?!!! Jul 14, 2016 This document describes the process on how to generate license key file from Product Authorization Key (PAK) file for Cisco Email Security Appliance (ESA), Web Security Appliance (WSA) and Security Management Appliance (SMA). How to generate license key file from PAK file that has been received for ESA, WSA and SMA. Jan 26, 2018 Cisco software licensing uses a system of validation keys to provide a simple mechanism for deploying new feature sets that offers Cisco customers increased functionality for upgrading and maintaining their software. Some feature sets on a Cisco device might need the license key. Cisco ios license key generator free.
Install / Append SSH Key In A Remote Linux / UNIX Servers Authorizedkeys. Linux / UNIX: Generate SSH Keys. Ubuntu 18.04 Setup SSH Public Key Authentication; Your support makes a big difference: I have a small favor to ask. More people are reading the nixCraft. Many of you block advertising which is your right, and advertising revenues. Sep 26, 2019 Manually generating your SSH key in macOS ›. To generate SSH keys in macOS, follow these steps: Enter the following command in the Terminal window. Ssh-keygen -t rsa. This starts the key generation process. When you execute this command, the ssh-keygen utility prompts you to indicate where to store the key. To create a new key pair, select the type of key to generate from the bottom of the screen (using SSH-2 RSA with 2048 bit key size is good for most people; another good well-known alternative is ECDSA). Then click Generate, and start moving the mouse within the Window. Putty uses mouse movements to. Jul 09, 2018 On the other hand, in key-based authentication, you need to generate SSH key pairs and upload the SSH public key to the remote system in order to communicate it via SSH. Each SSH key pair consists of a private key and public key. The private key should be kept within the client system, and the public key should uploaded to the remote systems.
Changing SSH Port
To change the Standard listening Port, you have to change the SSH Server configurations with the command below. We are using nano editor in this tutorial, you may use your own editor if you wish.
Then you need to edit the line that refers to the port number, for that you have to follow the instruction below.
Then change the port number from 22 to your preferable port (e.g. 2022) And press Ctrl +O and Ctrl +X in order to save and exit.
Then change the port number from 22 to your preferable port (e.g. 2022) And press Ctrl +O and Ctrl +X in order to save and exit.
We recommend enabling UFW (Uncomplicated Firewall) which is not enabled by default.
Now we are going to open your selected SSH port in your firewall (e.g. 2022):
At the end you have to restart the SSH service:
Disable root logins
You’ll be adding a layer of security to your SSH server if you disable root user logins. It would be more secure to brute force attacks or in case your password is stolen.
First, you need to create a non-root user with the following instructions:
First, you need to create a non-root user with the following instructions:
Then open the ssh configuration file with your editor. (we are using nano)
Then change the Highlighted line from “PermitRootLogin yes” to “PermitRootLogin no”
Crtl+O Crtl+X
Crtl+O Crtl+X
Create a key-based authentication SSH connection
If your Server is accessible over the Internet, you can use public key authentication instead of passwords, because SSH key authentication with password phrase is way more secure than password-only authentication, while a password can eventually be cracked with a Brute-force attack or keyloggers.
Depend on your client OS you should follow the instructions to create a pair of authentication keys.
Depend on your client OS you should follow the instructions to create a pair of authentication keys.
If you are using Windows:
![Xshell Xshell](https://vpsie.com/wp-content/uploads/2015/02/vpsie-ssh-keys.png)
You have to download the Putty key generator (a.k.a Puttygen)
Here is the recommended download link:
http://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
Here is the recommended download link:
http://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
- Open PuTTYgen utility.
- For Type of key to generate, select SSH-2 RSA
- In the Number of bits in a generated key field is refer to how complicated you want your key to be, you can change the value between 2048 to 4096 for make more complicated key.
- After selecting your settings click on Generate to start Process.
- Move your mouse pointer around in the blank area of the Key section, below the progress bar (to generate some randomness) until the progress bar is full.
- A private and public key pair has now been generated.
- (Optional): it’s also recommended to set a passphrase for your key.
- Save Private and Public keys
CAUTION: be careful with choosing the path you saving the keys, if you lose them and username/password logins are disabled on your server, you might lose your access to your server.
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- Then open your Putty, expand the SSH category and click on “Auth”
- In “private key file for authentication” browse your Private key.
- Finally, you should copy the Public key file in your server in this path:
If you are using Linux
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To generate an RSA key pair:
- Accept the default file location of /.ssh/id_rsa. Entering a passphrase is recommended
- The public key is written to ~/.ssh/id_rsa.pub The private key is written to ~/.ssh/id_rsa
- Copy the contents of ~/.ssh/id_rsa.pub from client system into the file ~/.ssh/authorized_keys on the Server.
- You may use “cat” command on the client side to view the file and use an editor like “nano” on the server side to modify or create the authorized_keys file.
- After all, it’s recommended to disable the Password authentication as well.
Uncomment these lines and change them refer to the line below:
Disable SSH Protocol 1
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SSH has two versions that may use, SSH v1 is older and less secure than protocol SSHv2 2, it’s recommended to be disabled unless you specifically need it.
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Uncomment the line “#
Protocol 2,1
” and change it to:Xshell 6 Key
You can add an extra layer of security with following the article below: