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Allow ssh connections ubuntu

Configure the router to accept only ssh connection with “ transport input ssh ” command. Configure ssh to version 2 using “ IP ssh version 2 ” and set the authentication times to 3 with “ IP ssh authentication-retries 3 ” command. Finally set the ssh timeout to 120 seconds with “ IP ssh time-out 120 ” command.

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This article is for Windows users who want to create and use secure shell (SSH) keys to connect to Linux virtual machines (VMs) in Azure. You can also generate and store SSH keys in the Azure portal to use when creating VMs in the portal.

  1. Connection Forwarding. One common use of SSH is forwarding connections, either allowing a local connection to tunnel through the remote host, or allowing the remote machine access to tunnel through the local machine. SSH can also do dynamic forwarding using protocols like SOCKS5 which include the forwarding information for the remote host.
  2. In order to accept SSH connections, a machine needs to have the server-side part of the SSH software toolkit. If you first want to check if OpenSSH server is available on the Ubuntu system of the remote computer that needs to accept SSH connections, you can try to connect to the local host: Open the terminal on the server machine.

To use SSH keys from a Linux or macOS client, see the quick steps. For a more detailed overview of SSH, see Detailed steps: Create and manage SSH keys for authentication to a Linux VM in Azure.

Overview of SSH and keys

SSH is an encrypted connection protocol that allows secure sign-ins over unsecured connections. SSH is the default connection protocol for Linux VMs hosted in Azure. Although SSH itself provides an encrypted connection, using passwords with SSH still leaves the VM vulnerable to brute-force attacks. We recommend connecting to a VM over SSH using a public-private key pair, also known as SSH keys.

The public-private key pair is like the lock on your front door. The lock is exposed to the public, anyone with the right key can open the door. The key is private, and only given to people you trust because it can be used to unlock the door.

  • The public key is placed on your Linux VM when you create the VM.

  • The private key remains on your local system. Protect this private key. Do not share it.

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When you connect to your Linux VM, the VM tests the SSH client to make sure it has the correct private key. If the client has the private key, it's granted access to the VM.

Depending on your organization's security policies, you can reuse a single key pair to access multiple Azure VMs and services. You do not need a separate pair of keys for each VM.

Your public key can be shared with anyone, but only you (or your local security infrastructure) should have access to your private key.

Users

Supported SSH key formats

Azure currently supports SSH protocol 2 (SSH-2) RSA public-private key pairs with a minimum length of 2048 bits. Other key formats such as ED25519 and ECDSA are not supported.

SSH clients

Recent versions of Windows 10 include OpenSSH client commands to create and use SSH keys and make SSH connections from PowerShell or a command prompt. This is the easiest way to create an SSH connection to your Linux VM, from a Windows computer.

You can also use Bash in the Azure Cloud Shell to connect to your VM. You can use Cloud Shell in a web browser, from the Azure portal, or as a terminal in Visual Studio Code using the Azure Account extension.

You can also install the Windows Subsystem for Linux to connect to your VM over SSH and use other native Linux tools within a Bash shell.

Create an SSH key pair

Create an SSH key pair using the ssh-keygen command. Enter a filename, or use the default shown in parenthesis (for example C:Usersusername/.ssh/id_rsa). Enter a passphrase for the file, or leave the passphrase blank if you do not want to use a passphrase.

Create a VM using your key

To create a Linux VM that uses SSH keys for authentication, provide your SSH public key when creating the VM.

Allow Ssh Connection Linux

Using the Azure CLI, you specify the path and filename for the public key using az vm create and the --ssh-key-value parameter.

Allow Ssh Connection Windows

With PowerShell, use New-AzVM and add the SSH key to the VM configuration using`. For an example, see Quickstart: Create a Linux virtual machine in Azure with PowerShell.

If you do a lot of deployments using the portal, you might want to upload your public key to Azure, where it can be easily selected when creating a VM from the portal. For more information, see Upload an SSH key.

Connect to your VM

With the public key deployed on your Azure VM, and the private key on your local system, SSH to your VM using the IP address or DNS name of your VM. Replace azureuser and 10.111.12.123 in the following command with the administrator user name, the IP address (or fully qualified domain name), and the path to your private key:

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If you configured a passphrase when you created your key pair, enter the passphrase when prompted.

Allow Ssh Connection Ubuntu 20.04

If the VM is using the just-in-time access policy, you need to request access before you can connect to the VM. For more information about the just-in-time policy, see Manage virtual machine access using the just in time policy.

Next steps

  • For information about SSH keys in the Azure portal, see Generate and store SSH keys in the Azure portal to use when creating VMs in the portal.

  • For detailed steps, options, and advanced examples of working with SSH keys, see Detailed steps to create SSH key pairs.

  • You can also use PowerShell in Azure Cloud Shell to generate SSH keys and make SSH connections to Linux VMs. See the PowerShell quickstart.

  • If you have difficulty using SSH to connect to your Linux VMs, see Troubleshoot SSH connections to an Azure Linux VM.