# SSH connections to NAF

On most computers used in computing-heavy research, a Unix type operating system is used.

A reason why many researchers prefer using a MacBook or a computer with one of the many options for a Unix/Linux based operating system, is that they can also develop their analysis software locally.

They can also connect with a computing node of the DESY computing centre, the NAF (national analysis facility) using the command line and the `ssh` command.

Read more here to learn about what ssh is and can provide for you:

{% embed url="<https://www.ucl.ac.uk/isd/what-ssh-and-how-do-i-use-it>" %}

However, also users of Windows computers can connect with such a computing node, using applications such as putty:

{% embed url="<https://www.chiark.greenend.org.uk/~sgtatham/putty/>" %}

Modern versions of the Windows operating system, such as Windows 10, also provide a native ssh client. It is even possible to install a linux subsystem on Windows 11: <https://docs.microsoft.com/en-us/windows/wsl/install>

Alternatively, you can use the jupyter instance on DESY NAF with a web-browser and start a new terminal there (although as a long-term solution, a dedicated ssh client is a better solution):

{% embed url="<https://naf-jhub.desy.de/>" %}

You can connect with NAF using the following command using ssh

```
ssh katsarov@naf-atlas.desy.de
```

With putty, you can use the following configuration:

* Host Name: `naf-atlas.desy.de`
* Login protocol: `SSH`

The username in the prompt when connecting is your DESY username and the password the associated password.

More documentation is provided here:

{% embed url="<https://confluence.desy.de/display/IS/NAF+Login%2C+WGS+and+remote+Desktop>" %}

{% embed url="<https://the.earth.li/~sgtatham/putty/0.77/htmldoc/Chapter2.html>" %}


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