Windows users can connect to Strelka using either PuTTY or MobaXterm. Connecting to Strelka requires a public/private key pair instead of a password.  Follow the instructions below to install either package, set up a key pair, and connect to Strelka.

PuTTY

PuTTY is a basic yet flexible program regularly used to interact with remote systems. Download PuTTY and install.

Setting up a key pair

Start the PuTTYgen program

• Under Parameters → Number of bits in a generated key → enter "2048" (don't include the quotes)

• Under Actions → Generate a public/private key pair → Click the "Generate" button

• Follow the instructions

• Under Actions → Save the generated key → Click "Save private key"

• Save private key file in a folder of your choosing.  Set filename to: "id_rsa.ppk"

• Copy the contents of the "Public key for Pasting into OpenSSH authorized_keys file" text box 

• Go to the Strelka Account Request page and paste the public key text into the box provided.

It may take a few days to create your Strelka account.  

Configuring PuTTY

Start the PuTTY program and configure as follows:

• Session → Hostname → Enter "strelka.swarthmore.edu" (don't include the quotes)

• Session → Connection type → check "SSH"

• Connection → Data → Auto-login username → Enter your Swarthmore username.  Usernames are case sensitive, so use all lowercase letters.

• Connection → SSH → Auth → select the "id_rsa.ppk" file created in the section above.

• Session → Saved sessions → enter "Strelka" in the text box and click "Save"

The configuration only needs to be done once.  In the future, the configuring can be loaded by starting PuTTY, selecting Session → Saved sessions, selecting "Strelka" and clicking "Load"

Connecting to Strelka

Connect to Strelka by clicking on "Open" button at the bottom of the window.

MobaXterm

MobaXterm is a powerful program that integrates a shell, file manager, X11 server, and additional utilities in one package. Download and install MobaXterm (the free Home Edition is sufficient).

Setting up a key pair

• Tools → MobaKeyGen (SSH key generator)

• Generate (follow the instructions to move your mouse randomly in the specified area)

• Save private key → save the private key file in a folder of your choosing, and set the filename to id_rsa.ppk

• Save public key → save the public key in a folder of your choosing so you have a backup of it if needed later

• Copy the entire contents in the text box under "Public key for pasting into OpenSSH server"

• Go to the Strelka Account Request page and paste the public key text into the box provided.

Configuring MobaXterm

• Session → SSH → Remote host →  enter strelka.swarthmore.edu

• Check Specify username → enter your Swarthmore username (case-sensitive, use all lowercase letters)

• Under Advanced SSH settings → check Use private key → click the file icon and navigate to the private key file (id_rsa.ppk) you generated above

• Click OK to save the session settings

Connecting to Strelka

The session will be saved in a list on the left side of the window; double-click on strelka.swarthmore.edu to connect.

Which program should I use?

Both PuTTY and MobaXterm provide similar functionality. PuTTY is lighter-weight, whereas MobaXterm comes with many additional utilities and capabilities that most users won't need. On the other hand, MobaXterm comes with a built-in X11 server, so if you intend to use graphical applications, it is an excellent all-in-one solution, plus it has other useful features, such as an integrated SFTP file manager, making it straightforward to upload and download files to/from Strelka. In the end, it is mostly personal preference.

Connecting to Strelka for Graphical Programs

It is possible to run graphical programs on Strelka using X11 forwarding; for further information please see these instructions to use GUI applications on Strelka.