Putty Ssh Windows

Putty Ssh Client Windows
Winscp 3.3
Putty Ssh Server For Windows

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Ask just about any.NIX admin using a Windows laptop and they will have come across Putty. For years, Apple MacBooks have been the go-to choice for many admins partly because getting to a ssh shell is so easy. The newly re-invigorated Microsoft is changing how easy it is to interface with Linux (and. PuTTY is an SSH and telnet client, developed originally by Simon Tatham for the Windows platform. PuTTY is open source software that is available with source code and is developed and supported by a group of volunteers.

This article describes ways to generate and use secure shell (SSH) keys on a Windows computer to create and connect to a Linux virtual machine (VM) in Azure. To use SSH keys from a Linux or macOS client, see the quick or detailed guidance.

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 connections still leaves the VM vulnerable to brute-force attacks or guessing of passwords. A more secure and preferred method of connecting to a VM using SSH is by using a public-private key pair, also known as SSH keys.

The public key is placed on your Linux VM, or any other service that you wish to use with public-key cryptography.
The private key remains on your local system. Protect this private key. Do not share it.

When you use an SSH client to connect to your Linux VM (which has the public key), the remote VM tests the client to make sure it possesses the 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 public-private key pair to access multiple Azure VMs and services. You do not need a separate pair of keys for each VM or service you wish to access.

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

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.

Windows packages and SSH clients

You connect to and manage Linux VMs in Azure using an SSH client. Computers running Linux or macOS usually have a suite of SSH commands to generate and manage SSH keys and to make SSH connections.

Windows computers do not always have comparable SSH commands installed. Recent versions of Windows 10 provide OpenSSH client commands to create and manage SSH keys and make SSH connections from a command prompt. Recent Windows 10 versions also include the Windows Subsystem for Linux to run and access utilities such as an SSH client natively within a Bash shell.

Other common Windows SSH clients you can install locally are included in the following packages:

You can also use the SSH utilities available in Bash in the Azure Cloud Shell.

Access Cloud Shell in your web browser at https://shell.azure.com or in the Azure portal.
Access Cloud Shell as a terminal from within Visual Studio Code by installing the Azure Account extension.

Create an SSH key pair

The following sections describe two options to create an SSH key pair on Windows. You can use a shell command (ssh-keygen) or a GUI tool (PuTTYgen). Also note, when using Powershell to create a key, upload the public key as ssh.com(SECSH) format. When using CLI, convert the key into OpenSSH format prior to uploading.

Create SSH keys with ssh-keygen

If you run a command shell on Windows that supports SSH client tools (or you use Azure Cloud Shell), create an SSH key pair using the ssh-keygen command. Type the following command, and answer the prompts. If an SSH key pair exists in the chosen location, those files are overwritten.

For more background and information, see the quick or detailed steps to create SSH keys using ssh-keygen.

Create SSH keys with PuTTYgen

If you prefer to use a GUI-based tool to create SSH keys, you can use the PuTTYgen key generator, included with the PuTTY download package.

To create an SSH RSA key pair with PuTTYgen:

Start PuTTYgen.
Click Generate. By default PuTTYgen generates a 2048-bit SSH-2 RSA key.
Move the mouse around in the blank area to provide randomness for the key.
After the public key is generated, optionally enter and confirm a passphrase. You will be prompted for the passphrase when you authenticate to the VM with your private SSH key. Without a passphrase, if someone obtains your private key, they can sign in to any VM or service that uses that key. We recommend you create a passphrase. However, if you forget the passphrase, there is no way to recover it.
The public key is displayed at the top of the window. You can copy this entire public key and then paste it into the Azure portal or an Azure Resource Manager template when you create a Linux VM. You can also select Save public key to save a copy to your computer:
Optionally, to save the private key in PuTTy private key format (.ppk file), select Save private key. You will need the .ppk file later to use PuTTY to make an SSH connection to the VM.
If you want to save the private key in the OpenSSH format, the private key format used by many SSH clients, select Conversions > Export OpenSSH key.

Provide an SSH public key when deploying a VM

To create a Linux VM that uses SSH keys for authentication, provide your SSH public key when creating the VM using the Azure portal or other methods.

The following example shows how you would copy and paste this public key into the Azure portal when you create a Linux VM. The public key is typically then stored in the ~/.ssh/authorized_key directory on your new VM.

Connect to your VM

One way to make an SSH connection to your Linux VM from Windows is to use an SSH client. This is the preferred method if you have an SSH client installed on your Windows system, or if you use the SSH tools in Bash in Azure Cloud Shell. If you prefer a GUI-based tool, you can connect with PuTTY.

Use an SSH client

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 myvm.westus.cloudapp.azure.com in the following command with the administrator user name and the fully qualified domain name (or IP address):

If you configured a passphrase when you created your key pair, enter the passphrase when prompted during the sign-in process.

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.

Connect with PuTTY

If you installed the PuTTY download package and previously generated a PuTTY private key (.ppk) file, you can connect to a Linux VM with PuTTY.

Start PuTTy.
Fill in the host name or IP address of your VM from the Azure portal:
Select the Connection > SSH > Auth category. Browse to and select your PuTTY private key (.ppk file):
Click Open to connect to your VM.

Next steps

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.

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Secure Shell (SSH) allows you to remotely administer and configure your Windows IoT Core device

Using the Windows 10 OpenSSH client

Important

The Windows OpenSSH client requires that your SSH client host OS is Windows 10 version 1803(17134). Also, the Windows 10 IoT Core device must be running RS5 Windows Insider Preview release 17723 or greater.

The OpenSSH Client was added to Windows 10 in 1803 (build 17134) as an optional feature. To install the client you can search for Manage Optional Features in Windows 10 settings. If the OpenSSH Client is not listed in the list of installed features then choose Add a feature.

Next select OpenSSH Client in the list and click Install.

To login with a username and password use the following command:

Where host is either the IP address of the Windows IoT Core device or the device name.

Putty Ssh Client Windows

The first time you connect you see a message like the following:

Type yes and press enter.

If you need to log in as DefaultAccount rather than as administrator you will need to generate a key and use the key to log in. From the desktop that you intend to connect to your IoT Device from, open a powershell window and change to your personal data folder (e.g cd ~)

Register the key with ssh-agent (optional, for single sign-on experience). Note that ssh-add must be performed from a folder that is ACL'd to you as the signed-in user (BuiltinAdministrators and the NT_AUTHORITYSystem user are also ok). By default cd ~ from powershell should be sufficient as shown below.

Tip

If you receive a message that the ssh-agent service is disabled you can enable it with sc.exe config ssh-agent start=auto

To enable single sign append the public key to the Windows IoT Core device authorized_keys file. Or if you only have one key you copy the public key file to the remote authorized_keys file.

If the key is not registered with ssh-agent it must be specified on the command line to login:

If the private key is registered with ssh-agent then you only need to specify DefaultAccount@host:

The first time you connect you see a message like the following:

Type yes and press enter.

You should now be connected as DefaultAccount

To use single sign-on with the administrator account, append your public key to c:dataProgramDatasshadministrators_authorized_keys on the Windows IoT Core device.

You will also need to set the ACL for administrators_authorized_keys to match the ACL of ssh_host_dsa_key in the same directory.

To set the ACL using powershell

Winscp 3.3

Note

If you see a REMOTE HOST IDENTIFICATION CHANGED message after making changes to the Windows 10 IoT Core device, then edit C:Users<username>.sshknown_hosts and remove the host that has changed.

Using PuTTY

Download a SSH client

In order to connect to your device using SSH, you'll first need to download a SSH client, such as PuTTY.

Putty Ssh Server For Windows

Connect to your device

In order to connect to your device, you need to first get the IP address of the device. After booting your Windows IoT Core device, an IP address will be shown on the screen attached to the device:
Now launch PuTTY and enter the IP address in the Host Name text box and make sure the SSH radio button is selected. Then click Open.
If you're connecting to your device for the first time from your computer, you may see the following security alert. Just click Yes to continue.
If the connection was successful, you should see login as: on the screen, prompting you to login.
Enter Administrator and press enter. Then enter the default password p@ssw0rd as the password and press enter.
If you were able to login successfully, you should see something like this:

Update account password

It is highly recommended that you update the default password for the Administrator account.

To do this, enter the following command in the PuTTY console, replacing [new password] with a strong password:

Configure your Windows IoT Core device

To be able to deploy applications from Visual Studio 2017, you will need to make sure the Visual Studio Remote Debugger is running on your Windows IoT Core device. The remote debugger should launch automatically at machine boot time. To double check, use the tlist command to list all the running processes from powershell. There should be two instances of msvsmon.exe running on the device.
It is possible for the Visual Studio Remote Debugger to time out after long periods of inactivity. If Visual Studio cannot connect to your Windows IoT Core device, try rebooting the device.
If you want, you can also rename your device. To change the 'computer name', use the setcomputername utility:
You will need to reboot the device for the change to take effect. You can use the shutdown command as follows:

Commonly used utilities

See the Command Line Utils page for a list of commands and utilities you can use with SSH.