Delta Login Methods


If you don’t have an allocation on Delta, go to Delta Allocations to learn how to submit an allocation request.

Once you have a Delta allocation, the primary methods for logging into Delta are:

Direct Access Login Nodes

Direct access to the Delta login nodes is via SSH using your NCSA username, password, and NCSA Duo MFA. The login nodes provide access to the CPU and GPU resources on Delta. See the NCSA Allocation and Account Management page for links to NCSA Identity and NCSA Duo services.

ACCESS awarded projects - Your NCSA username is in your ACCESS Profile; once logged in, scroll to the bottom of the page to the “Resource Provider Site Usernames” table. If you don’t know your NCSA username, submit a support request for assistance.

Login Node Hostnames


In January 2024, Delta was upgraded to Slingshot11. Please use the round robin login,, to SSH into the system. For single host SSH, use,, or See the ACCESS Delta Notice: Delta maintenance 01-23-2024 - 01-25-2024 for more details.

Login Node Hostnames

Login Node Hostname


This is the preferred hostname. Alias that round robin logs into one of the two Delta login nodes.

Alias that round robin logs into one of the two Delta login nodes.

One of the Delta login nodes.

One of the Delta login nodes.

One of the Delta login nodes.

SSH Examples

In the examples below, replace username with your Delta login username.

  • Round robin log into a login node

  • -l username is an alternative syntax for <user>@<host>

    ssh -l username
  • -Y allows X11 forwarding from Linux hosts

Use of SSH key pairs is disabled for general use. This means that most individual users, even principal investigators (PIs), are not allowed to use SSH key pairs to log in instead of 2-factor authentication.

The one exception is: if you are the PI of a Gateway allocation (this is not most projects), then please submit a support request to get the Gateway account’s key pairs set up.

Maintaining Persistent Login Sessions: tmux

The tmux utility is available on login nodes to maintain persistent login shells. This is a great technique to keep your shell alive for days and between network disconnects.

After making note of the hostname, use the targeted login hostnames (dt-login01, dt-login02, dt-login03, or dt-login04) to attach to the login node where you started tmux. Avoid the round-robin hostname when using tmux.

See the tmux man page for more information.

SSH Keyboard-Interactive

For command line SSH clients, use the following settings if you have trouble logging in to Delta:

ssh -o PreferredAuthentications=keyboard-interactive,password

Open OnDemand

With Open OnDemand (OOD), you can access Delta, in a web browser! Go to Open OnDemand on Delta for more topics including:

  • Shell interface.

  • Interactive apps: Jupyter Lab, Code Server (VS Code), TensorBoard, and Desktop (virtual Linux desktop).

  • Jupyter Lab customization for Anaconda Environments and R.

How to Log Into the Delta OOD Dashboard

  1. Navigate to the Open OnDemand dashboard.

  2. Log in through CILogon with your NCSA username, password, and Duo MFA.

  3. Once logged in, navigate the dashboard using the menu bar at the top of the window.

    Open OnDemand home screen showing the "files", "jobs", "clusters", "interactive apps", and "my interactive sessions" options in the menu bar at the top of the window.

VS Code

Refer to Visual Studio Code, Remote - SSH