Jupyter Notebooks issue

Status page for the Harvard FAS Research Computing cluster and other resources.

Cluster Utilization (VPN and FASRC login required): Cannon | FASSE

Please scroll down to see details on any Incidents or maintenance notices.
Monthly maintenance occurs on the first Monday of the month (except holidays).

GETTING HELP
Documentation: https://docs.rc.fas.harvard.edu | Account Portal https://portal.rc.fas.harvard.edu
Email: rchelp@rc.fas.harvard.edu | Support Hours

The colors shown in the bars below were chosen to increase visibility for color-blind visitors.
For higher contrast, switch to light mode at the bottom of this page if the background is dark and colors are muted.

Resolved

Under maintenance

Started 26 days agoSeptember 15, 2026Lasted 21 hours 13 minutesSeptember 15, 20267:49 PMSeptember 16, 20265:02 PMUTC

Affected

OpenOnDemand/OOD

Cannon Open OnDemand

FASSE Open OnDemand

Software & Licensing

Software & Modules

Updates

Resolved
September 16, 2026 at 5:02 PMUTC
Resolved
September 16, 2026 at 5:02 PMUTC
JupyterLab 4.5.0 is now being used for new OOD Jupyter sessions.
This incident has been resolved.
Monitoring
September 15, 2026 at 7:49 PMUTC
Monitoring
September 15, 2026 at 7:49 PMUTC
A bug in Jupyter AI 3.1.3 is causing idle notebooks to lose data. To remedy this, we will be reverting from Jupyter Lab 4.6.3 (with Jupyter AI 3.1.3) to the previous JupyterLab 4.5.0 release (without Jupyter AI) today

If you have experienced this, check auto-saved Jupyter notebook snapshots in
.ipynb_checkpoints/
in your working directory.

Existing or currently running Jupyter notebooks will not be affected by this.

FAS Research Computing - Jupyter Notebooks issue – Incident details

Jupyter Notebooks issue