The SSH client is not part of Windows and needs to be installed. The most commonly used client is PuTTY.

The PuTTY is a client for SSH, Telnet, rlogin and bare TCP protocols. It is developed as open source software. The latest version can be downloaded here. The program consists of a single exe file, which you can place in e.g. the directory “c:\program files\putty”.

If you are going to run programs with a graphical interface (MATLAB) on the server, it is necessary to have an X server installed. The recommended one is VcXsrv Windows X Server, which is available in both 32-bit and 64-bit versions.

• 1. Run the putty program. In the Host name (or IP address) field, type kraken.
  In the Port field, leave 22.

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• 2. Go to the program configuration, Connection → SSH → X11 tab. Check the Enable X11 forwarding box.

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• 3. Return to the Session home tab and in the Saved Sessions field, type the name under which your session will be saved.
• 4. Click the Save button to save the configuration.
• 5. Use the Open button to start the connection.

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If you want to use GUI programs on the server (e.g. MATLAB), you need to run VcXsrv X Server before connecting. In the programs menu, go to VcXsr and run the program VcXsr.

If the X server is running, its icon will appear in the tray.

• 6. The terminal window opens and the login process starts.
• 7. If you are logging in for the first time, a warning window appears. PuTTY does not “know” the remote server and asks if the server is trusted. Answer Yes.

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• 8. A terminal window opens and the login process begins. You will be prompted for a username and password. If you have entered both correctly, you will be logged in.

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• 9. If you are logging in for the first time, you need to change your password. To change your password, use the passwd command. You must first enter your current password.

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• 10. Then you enter the new password. If the password you choose is too simple, the server will not approve the password and will prompt you to choose a more complex password.
• 11. You ask for the new password again to check it.
• 12. If you have successfully changed the password on the kraken-M1 node, it will be automatically copied to the remaining nodes (M2,M3,M4,M5,M6). You do not need to “manually” change the password on the other nodes.
• 13. Do the same for the L cracks.