5 - PuTTY

Go to http://www.putty.org to download a free copy of PuTTY package and install it in Microsoft Windows.
Download the windows installer or the zip file, not just PuTTY.exe
The package contains the PuTTY scp and ftp utilities and a ssh key generator that supports RSA/ECDSA/DSA public/private key pairs for ssh password-less login and encryption.

load "Default Settings"
under Category: (left side of PuTTY screen)
- under Connection
  - under SSH (click on + to expand SSH)
    - click on X11
on the right side of the screen, in the "X11 forwarding" group
- check the "Enable X11 forwarding" box
- in the "X display location" field enter: localhost:0
Under Category
- click on Session
save "Default Settings"

3. repeat step 2 for any existing saved sessions in which you wish to use X-Windows/xterm services

4. Start the X-Windows Server

5. Start a PuTTY session and connect to a AIX/Linux/Unix/Solaris server that has x-windows services running

Refer to these images for generating a key:

Load the PuTTY Key Generator program (puttygen.exe).
Set the key parameters: I suggest you create a SSH-2 RSA with a bit length of at least 2048.
After selecting the Generate key/button, move the mouse over the blank area of the key field while the key is being generated.
Save the public key. I save it in the putty install directory.
Save the private key.
You must decide if you are going to use a passphrase to protect access to the private key.
A passphase is a very good idea (for my staff it is REQUIRED)
You can use the PuTTY agent (pageant.exe) utility to load the private key into memory on your private access PC.
- Do NOT use pageant on a public use PC as your private key is in memory and is more easily compromised.
WARNING: Read the pageant pages in the PuTTY help file regarding security concerns.
Load the public key in the remote host.
A remote host is every host to which PuTTY connects including a local Cygwin install.

Use PuTTY to connect to the remote host.
Enter command: cd .ssh
Enter command: vi authorized_keys
Swipe the entire public key in the PuTTY Generator session (see the image above).
Switch to insert mode in the vi session.
Paste the key in the file via the right mouse button
Save and exit (:wq command in vi).
Configure PuTTY to use the Private Key
Load the desired PuTTY session (if you have a saved session).
Under Category: (left side of PuTTY screen)
Under Connection
- Under Data
  - On the right side of the screen, under Login details
  - you may enter the Auto-login username to be used for the session
- Under SSH (expand SSH by clicking on the + symbol)
  - Under Auth, in the "Authentication parameters" group
    - On the right side of the screen, under "Private key for authentication:"
    - load the location and name of your private key file
- Under X11
  - On the right side of the screen, in the "X11 forwarding" group
    - check the "Enable X11 forwarding" box
    - In the "X display location" field enter: localhost:0
Under Category
Click on Session
Save the settings if you wish
Start the session
If all is well then you should connect to the remote host via PuTTY with ssh without using a password.
You may have to enter the login user name.

Open PuTTY from the Windows destop icon that you installed
Load "Default Settings"
Under Category: (left side of PuTTY screen)
Under Connection
Under Data
- On the right side of the screen, under Login details you may enter the Auto-login username to be used for the session
Under SSH
Click on Auth
On the right side of the screen, under "Private key for authentication:"
- load the location and name of your private key file
Click on X11
On the right side of the screen, under X11 forwarding, check the "Enable X11 forwarding" box
Under Category
Click on Session
Save "Default Settings"
Repeat the above for any existing saved sessions for which you wish to use X-Windows/xterm services

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