1581081 : Unable to log in to desy JupyterHub

Created: 2026-03-03T09:57:13Z - current status: new

Here is the anonymized and summarized version of the reported issue:

Summary of the Issue

A user has been unable to log in to JupyterHub on the Maxwell cluster for two days. During login attempts, they encounter an error message stating "We are sorry...". The user has already contacted the DESY user support team (uco@desy.de) but the issue persists.

Possible Solution / Next Steps

  1. Verify Maxwell Cluster Access:
  2. Ensure the user’s account has active access to the Maxwell cluster, as JupyterHub login requires valid cluster permissions.

  3. If access was recently granted, confirm with the support team that the permissions are properly synchronized.

  4. Check DESY SSO Status:

  5. The error may stem from a broader Single Sign-On (SSO) issue. The user should verify if their DESY credentials work for other services (e.g., email, internal portals).

  6. If SSO is non-functional, escalate to uco@desy.de for further investigation.

  7. Clear Browser Cache/Cookies:

  8. Corrupted session data can cause login failures. The user should try:

    • Clearing browser cache/cookies for max-jhub.desy.de.
    • Using a private/incognito window or a different browser.

  9. Review JupyterHub Status:

  10. Check if there are known outages or maintenance on the Maxwell cluster by:

  11. Alternative Access:

  12. If JupyterHub remains inaccessible, the user can try launching a standalone Jupyter notebook server on a Maxwell login node (if they have SSH access): bash /software/tools/bin/jupyter-standalone.sh Note: This requires a DESY network connection.

Sources Referenced

  1. JupyterHub on Maxwell
  2. Maxwell Support Contacts