CELS IT is planning a scheduled maintenance outage affecting services hosted in the building 240 data center on Monday, May 18, 2026. Why: The 240 Building facilities team is performing cooling capacity maintenance that requires all equipment in the north data hall to be powered down. Timeline: Monday, May 18 at 2:00 PM CT — …

The next Business and Information Services (BIS) information technology (IT) maintenance weekend will start at 5 p.m. CT on Friday, Jan. 9, and continue through noon Sunday, Jan. 11, 2026. Please backup your work prior to 5 p.m. on Friday, Jan. 9, as rolling, intermittent, network outages will affect most networked buildings on the Lemont …

Back in September, when Apple released macOS 26 “Tahoe,” we asked the CELS community to hold off on upgrading. We appreciate your patience and cooperation, which allowed us the time to perform crucial compatibility testing. We are happy to announce that our validation process is complete! CELS IT has officially cleared macOS Tahoe 26 for …

CELS has been planning on adding MFA to all of its services and the next step along this path is to require Duo MFA for the CELS Accounts System (accounts.cels.anl.gov) starting November 17, 2025.  Note that nothing will happen until November 17; at that time it will force you to enroll in MFA unless you …

compute-386-08.cels.anl.gov aka compute-08.cels.anl.gov will be taken offline November 3rd and the disk will be wiped. If you have any files on this server (under /scratch), please make a backup copy before then. The files under /home and /nfs are network filesystems, so no data will be lost from those. We’ll be using this server to test …

System Maintenance Notice When: Tuesday, 10/21/2025 Time: 7:00 AM to 12:00 PM CDT What: OS and application updates The CELS Systems Group will conduct OS and application updates for the systems listed below. During this maintenance window, these systems will be intermittently unavailable as we apply updates and restart them. We expect to restore them …

Hi, everyone! Some changes are coming to how you authenticate to your Slack workspaces hosted by CELS.  To retain our ability to use Slack, we must enforce multi-factor authentication for all users.  This is going into effect beginning on October 20th for all workspaces at https://grid-cels-anl.enterprise.slack.com/. Guest accounts already require 2 factor authentication, so nothing …

Apple has just rolled out its latest operating system, macOS 26, also known as “Tahoe.” It’s always exciting to see the new capabilities and features that come with a major OS release. However, before you click that “Upgrade Now” button, we have some important guidance to share. Hold Off on the Upgrade for Now To …

We are currently experiencing a failure with NFS mounted home directories. We’ve opened a ticket with the vendor (Netapp) and will provide updates when available. While the outage continues, you’ll be unable to login to any server with a NFS user home directory, including homes.cels.anl.gov, compute-XX, and Linux workstations.

On Tuesday, June 17, 2025, from 3:00 PM to 4:00 PM CDT, the CELS Systems Group will perform updates to the Confluence service hosted at https://apps.cels.anl.gov/confluence. The Confluence service will be temporarily unavailable during this period as we update and restart the system. We expect that the service will be restored by 4:00 PM or possibly earlier. If …