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1. Port Forwarding with SSH
Problem: Since many programs use services that send clear-text data over the network, it is desirable to find something that can be used to encrypt the network traffic for these services while minimizing any change to end users. SSH provides this functionality with port forwarding. Port forwarding allows a user to create an encrypted session from a client to a remote server for any TCP-based service by tunneling the service through SSH. Of course, this requires that the user have an account on the remote server and tha...

2. How to use PuTTY Passphrase Agents
STEP1: Use Pageant to store your private keys in memory To make public key authentication more convenient, the developers of PuTTY created Pageant. Pageant is a program included with PuTTY that will keep your decrypted private keys in memory so you only have to enter your passphrase once rather than every time you authenticate to a server using public key authentication. While this will make your day-to-day use more convenient, please keep in mind that it also poses a slight risk, since other applications (inc...

3. Interactively transfer files from the command line with PSFTP
One method to transfer files from the Windows command line is to use PSFTP. PSFTP creates an interactive SFTP file transfer session where you can use many of the commands available within a normal FTP session. Since PSFTP uses the SFTP protocol, which is only available with servers running protocol SSHv2, you may not be able to run it on every server. PSFTP is run from the command line and provides numerous options. To see the options available run PSFTP with the –h option: ...

4. Using Plink to initiate an SSH session from the command line or a script
Using PuTTY from the command line will create an SSH interactive session. This may not be what we want if for example we need to remain at the Windows command line or we want to issue an SSH command from within a script. In order to satisfy these types of needs, PuTTY provides a tool called Plink. Plink is a command line tool that will allow you to log in to a remote machine using SSH and either create an SSH session or execute a command, all from the command line and without opening another window. Plink comes with many comma...

5. How to Generate a Key Pair Using OpenSSH
Problem: How can a key-pair be created in OpenSSH?STEP1: Generating your public/private key-pairThe ssh-keygen command is utilized to generate your public and private keys. OpenSSH provides authentication methods via a choice of three public key "cryptosystems": RSA1, RSA, and DSA. RSA1 works with SSHv1 while RSA and DSA are for SSHv2. RSA and DSA use different techniques for authenticating and have different capabilities, but for purposes of this guide, either will suffice.To create a key-pair, r...

6. Transfer files from the command line with PSCP
A second method to transfer files from a Windows command line prompt is to use PSCP. Unlike PSFTP, PSCP is not interactive and is designed to transfer files "in one shot" and then exit, much like OpenSSH's scp command. PSCP also allows you to specify wildcards within filenames (PSFTP does not). Additionally, PSCP will work with any SSH server as it is not dependent on SSHv2 being present. Note  PSCP will blindly copy files to the remote server, overwriting any files with the same name, without prompting for veri...

7. Install SSH Windows Clients to Access Remote Machines Securely
Problem: Many times administrators will find themselves on a Windows machine with no way to access a remote server securely since Microsoft does not yet package an SSH client. There are a number of excellent tools available that provide SSH client connectivity from a Windows platform. A list of these tools is available at http://www.openSSH.com/windows.html. ...

8. How to use OpenSSH Passphrase Agents
Problem: Using public key authentication makes logging in to a server with SSH more secure, but less convenient due to having to type in a longer and more complex passphrase. STEP1: Use ssh-agent and ssh-add to store your private keys in memory To make public key authentication more convenient to use, the OpenSSH developers created the ssh-agent and ssh-add programs. These programs are designed to keep your private keys decrypted in memory for your current session. With ssh-agent, you will not ne...