University of Cambridge Computer Laboratory - Notice history

All systems operational

100% - uptime

Caelum Console (server management) - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Request Tracker - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Other Internal Services - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

External Services - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Network - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime
100% - uptime

GN09 - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

WCDC - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime
100% - uptime

Main VM Pool (WCDC) - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

GPUs - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Secondary VM Hosts - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Xen Orchestra - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime
100% - uptime

Filer - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Archive Server - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Data Replication - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime

Other Secondary Storage Systems - Operational

100% - uptime
Oct 2025 · 100.0%Nov · 100.0%Dec · 100.0%

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Oct 2025100.0% uptime
Nov 2025100.0% uptime
Dec 2025100.0% uptime
100% - uptime

Third Party: Fastmail → General Availability - Operational

Third Party: Fastmail → Mail delivery - Operational

Third Party: Fastmail → Web client and mobile app - Operational

Third Party: Fastmail → Mail access (IMAP/POP) - Operational

Third Party: Fastmail → Login & sessions - Operational

Third Party: Fastmail → Contacts (CardDAV) - Operational

Notice history

Dec 2025

No notices reported this month

Nov 2025

No notices reported this month

Oct 2025

University-wide network instability
  • Resolved
    Resolved

    The incident appears to have ended.

  • Monitoring
    Monitoring

    The disruption seems to have ended, though we have not had any official confirmation that the fault is resolved.

  • Investigating
    Investigating

    We are observing some intermittent issues with the University's internet/Janet connection, which may impact performance of certain services and websites. This issue is outside of the department and is affecting the whole University.

Urgent VPN2 maintenance
  • Planned
    28 October, 2025 at 20:00
    Planned
    28 October, 2025 at 20:00

    The servers hosting VPN2 will be restarted this evening to mitigate an urgent security issue. All connections to VPN2 will be dropped, and may for a few minutes be unable to reconnect.

  • Completed
    27 October, 2025 at 20:12
    Completed
    27 October, 2025 at 20:12
    Maintenance has completed successfully.
West Cambridge electrical instability
  • Resolved
    Resolved

    The electrical supply has been stable since 11:05.

    However the UK Power Networks incident is still open and indicates that the electrical supply to northwest Cambridge is currently rerouted around a faulty HV cable; this means there may be future brief interruptions whilst the fault is repaired. We don't know when this will happen or how disruptive it will be.

  • Update
    Update

    A further electrical supply problem occurred at 11:05; PCs in offices and non-UPS-protected servers in GN09 may have again powered off or rebooted.

  • Monitoring
    Monitoring

    We are aware of an instability of the electrical supply ("brown out") in the William Gates Building around 10:12. This caused some network infrastructure and some computers (including some servers in GN09) to reboot but we believe that everything affected should now be working again. Contact service-desk@cst.cam.ac.uk if you are aware of any remaining problems.

GN09 cooling fault
  • Resolved
    Resolved

    This incident has been resolved.

    Please contact service-desk@cst.cam.ac.uk if you are experiencing any ongoing issues.

  • Update
    Update

    Caelum users are free to turn their servers on again via the Caelum Console.

    VM users are free to turn their VMs on again via Xen Orchestra.

  • Update
    Update

    The chiller is operational again. We will start to bring affected services back online. This will take time and we will provide another update when this is complete.

  • Identified
    Identified

    Cooling for GN09 is currently inoperable. Engineers are on the way, but due to climbing temperatures, we will have to shut down all research and teaching servers shortly.

Oct 2025 to Dec 2025

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