https://www.nas.nasa.gov/hecc/support/kb/91/ https://www.nas.nasa.gov/hecc/support/kb/two-step-connection-using-the-nasa-piv-badge_663.html If you have a NASA badge that is embedded with a personal identity verification (PIV) certificate, you can use your NASA PIV personal identification number (PIN) to access a NAS secure front-end system (SFE). In this case, connections from your... Logging In/Subsequent Logins Thu, 23 Jul 2026 11:11:38 -0700 https://www.nas.nasa.gov/hecc/support/kb/common-login-failures-or-issues_162.html Use the information in this section to help troubleshoot any problems you encounter when logging into NAS systems. SSH Known-Hosts Error A successful host verification indicates that your Secure Shell (SSH) client has established a secure... Logging In/Troubleshooting Thu, 23 Jul 2026 10:54:04 -0700 https://www.nas.nasa.gov/hecc/support/kb/using-mobaxterm-for-ssh-connections-from-windows-systems-to-nas_642.html You can use MobaXterm to connect from your local Windows system to NAS systems via SSH, as an alternative to Cygwin/OpenSSH. MobaXterm includes a built-in X11 client, and has the ability to forward X11 from NAS systems back to your local system.... Logging In/Setting Up Public Key & SSH Passthrough Wed, 25 Mar 2026 13:39:05 -0700 https://www.nas.nasa.gov/hecc/support/kb/vnc-a-faster-alternative-to-x11_257.html Virtual Network Computing (VNC) software provides a way to reduce X11 overhead on high-latency networks such as the Internet. In practical terms, once a VNC session is underway, latencies are on the order of seconds rather than minutes. VNC can... Logging In/Setting Up Your Login for Improved Graphics Performance Wed, 25 Mar 2026 13:34:03 -0700 https://www.nas.nasa.gov/hecc/support/kb/one-step-connection-using-public-key-and-passthrough_62.html This method requires that you first set up public key authentication and SSH passthrough. Once those steps are completed, you can connect from your local system to a system inside the NAS enclave with one single use of SSH, as follows: ... Logging In/Setting Up Public Key & SSH Passthrough Wed, 25 Mar 2026 13:22:42 -0700 https://www.nas.nasa.gov/hecc/support/kb/x11-forwarding_256.html To run X applications (such as xclock, emacs, totalview, etc) on the X client host (for example, a NAS system such as pfe25, etc.) and display them back to an X server (such as your local system), the simplest way is to use SSH X11 Forwarding. If... Logging In/Setting Up Your Login for Improved Graphics Performance Wed, 25 Mar 2026 13:21:37 -0700 https://www.nas.nasa.gov/hecc/support/kb/using-the-screen-or-tmux-commands_709.html Screen and tmux are terminal multiplexers available on all of the front-end systems within the NAS enclave (PFEs, AFEs, CFEs, CGHFEs, or LFEs). These utilities allow you to have persistent sessions on a these systems that can be used to reestablish... Logging In Wed, 25 Mar 2026 10:27:48 -0700 https://www.nas.nasa.gov/hecc/support/kb/setting-up-ssh-passthrough_232.html NAS supercomputers are served by several front-end systems within the secure enclave. These include: Athena: athfe[01-04] Cabeus: cfe[01-02], cghfe[01-02] Aitken Milan: afe[01-02] Aitken Cascade Lake & Rome; Electra; Endeavour:... Logging In/Setting Up Public Key & SSH Passthrough Wed, 25 Mar 2026 09:46:39 -0700 https://www.nas.nasa.gov/hecc/support/kb/using-the-front-end-load-balancer-among-the-pfes_233.html To provide a load-balanced front-end environment, NAS provides a load-balancing tool that can automatically select the least-loaded among the PFE systems when you log in. The system load is measured as a weighted function of disk, processor, and... Logging In/Subsequent Logins Wed, 25 Mar 2026 09:40:46 -0700 https://www.nas.nasa.gov/hecc/support/kb/nas-vpn-service_268.html NAS Staff Only: This article is applicable only to NAS Division staff. Two virtual private network (VPN) services are available to local NAS staff to provide limited access to some NAS and/or Ames Research Center systems while working remotely,... Logging In/NAS VPN Service Wed, 03 Dec 2025 16:57:48 -0800 https://www.nas.nasa.gov/hecc/support/kb/two-step-connection-using-public-key-and-securid-passcode_231.html If you have set up public key authentication for one or more of the secure front ends (SFEs), you are ready to do this two-step connection from your local system to a system inside the secure enclave, such as a PFE or LFE. Before You Begin: If... Logging In/Setting Up Public Key & SSH Passthrough Wed, 03 Dec 2025 11:09:15 -0800 https://www.nas.nasa.gov/hecc/support/kb/using-the-secure-unattended-proxy-(sup)_145.html UPDATE: As of June 2, 2023, you must ensure that your SUP client has been updated with the latest version 8.13 (available below). You must do one of the following to replace their SUP client manually: Follow the installation instructions for the... Logging In/Setting Up Secure Unattended Proxy (SUP) Tue, 07 Oct 2025 16:35:01 -0700 https://www.nas.nasa.gov/hecc/support/kb/logging-into-nas-systems_60.html Once you successfully enable your RSA SecurID token and log in for the first time, you can continue to log into NAS systems using the two-step connection process—in which you first log into a secure front end (SFE), and then into another NAS... Logging In/Subsequent Logins Tue, 23 Sep 2025 13:15:27 -0700 https://www.nas.nasa.gov/hecc/support/kb/two-step-connection-using-rsa-securid-passcode-and-nas-password_53.html Once you have your NAS password and RSA SecurID token enabled, you can use the RSA SecurID passcode + your NAS password to complete two-factor authentication to a NAS secure front-end system (SFE). In this case, connection from your local system to... Logging In/Subsequent Logins Tue, 23 Sep 2025 12:58:58 -0700 https://www.nas.nasa.gov/hecc/support/kb/enabling-your-rsa-securid-soft-token-(mobile-app)_538.html Once you enable your RSA SecurID soft token, you can log into the secure NAS enclave to set up a personal identification number (PIN) and change your default NAS password. Note: If you have a NAS-provided hard token (fob), see Enabling Your RSA... Logging In/First-Time Login Thu, 01 Jun 2023 10:25:47 -0700