Schoolyear incident

Students stuck on white screen during AVD-exam

Minor Resolved View vendor source →

Schoolyear experienced a minor incident on September 30, 2026 affecting Microsoft Azure, lasting 7d 4h. The incident has been resolved; the full update timeline is below.

Started
Sep 30, 2026, 07:41 AM UTC
Resolved
Oct 07, 2026, 12:10 PM UTC
Duration
7d 4h
Detected by Pingoru
Sep 30, 2026, 07:41 AM UTC

Affected components

Microsoft Azure

Update timeline

  1. investigating Sep 30, 2026, 07:41 AM UTC

    We have received a couple of reports that students are stuck an a white screen while launching the AVD exam. We are currently investigating this issue.

  2. identified Sep 30, 2026, 07:55 AM UTC

    We have identified that Microsoft has changed some of its domains. As a result, the enforced whitelist now blocks these domains, which prevents exams from starting. We are currently investigating how to update the whitelist and apply the change to existing exams.

  3. monitoring Sep 30, 2026, 08:34 AM UTC

    We have identified the new domains and deployed a fix to production that updates the whitelist for both running and scheduled exams. Students who restart the Schoolyear Client will receive the updated whitelist, and the issue should no longer occur.

  4. resolved Sep 30, 2026, 09:35 AM UTC

    Since the fix was deployed, we have received no further reports, and exams are starting successfully with AVD again. This confirms the fix is working as intended. The issue seem to be completely resolved now. We will follow up with a post-mortem as soon as possible.

  5. resolved Oct 07, 2026, 12:10 PM UTC

    A detailed post-mortem is now available at: https://help.schoolyear.com/hc/en-gb/articles/39707885998493-Incident-Postmortem-on-30-09-2026.