Gateway
Hosted Services
OSC provides hosted instances of specialized applications that require dedicated server infrastructure and authentication methods. These services run continuously on OSC systems, allowing research groups to access applications through a web browser.
Rolling Reboot for Security Fix
A rolling reboot is in progress to address CVE-2026-23111 for all clusters, including Ascend, Cardinal, and Pitzer. Login nodes will be rebooted first and access will be temporarily disrupted. Compute nodes will reboot in a rolling fashion; running jobs will not be impacted. See: https://www.osc.edu/resources/technical_support/known_issues/rolling_reboot_for_security_fix
Temporary Login Node Instability on Ascend
We are currently experiencing temporary instability on the Ascend login nodes, which may result in slow response times or unexpected session disconnects. Our team is actively investigating the issue and will share updates as more information becomes available.
ptrace Disabled Across OSC Systems
ptrace has been disabled globally across all OSC systems to mitigate a newly identified Linux kernel vulnerability. See this known issue for more details: https://www.osc.edu/resources/technical_support/known_issues/ptrace_disabled_across_osc_systems
System Downtime May 12 2026
A downtime for OSC HPC systems is scheduled from 7 a.m. to 9 p.m., Tuesday, May 12, 2026. The downtime will affect the Pitzer, Cardinal and Ascend Clusters, web portals, the state-wide licenses and HPC file servers. MyOSC (the client portal) will be available during the downtime. In preparation for the downtime, the batch scheduler will not start jobs that cannot be completed before 7 a.m., May 12. Jobs that are not started on clusters will be held until after the downtime and then started once the system is returned to production status.
Reboot of Public-Facing Systems for Security Fix
Due to a critical security vulnerability we need to reboot public-facing systems to deploy a mitigation against the vulnerability. Please use support.osc.edu if you have questions or concerns.
Default MPI Module Update
The default MPI module, MVAPICH, will be updated from version 3.0 to 4.1 on May 12, 2026, during the upcoming scheduled downtime. For more information, please visit: https://www.osc.edu/resources/technical_support/hpc_changelog/2026/default_mpi_module_update
OnDemand Shell App Not Working in Firefox 148
We are aware of an issue where the OnDemand Shell app is not functioning in Firefox 148. If you encounter this problem, please use a different browser to access the OnDemand Shell app until this issue is resolved. We have confirmed that Chrome, Edge, and Safari are working.
Duo Mobile Update Required
For OSC users who require Multi Factor Authentication (MFA), please update Duo Mobile to version 4.85.0 or later by Feb. 2, 2026 to avoid login issues. To check your version, open Duo Mobile and scroll to the bottom. To see whether your OSC account requires Duo, log into my.osc.edu and check whether you are in the Duo group. Questions? Open a case at https://support.osc.edu.
