University of Cambridge Computer Laboratory - Notice history

External Services experiencing degraded performance

100% - uptime

Caelum Console (server management) - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Request Tracker - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Other Internal Services - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

External Services - Degraded performance

100% - uptime
Jul 2026 · 100.0%Aug · 99.38%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 202699.38% uptime
Sep 2026100.0% uptime

Network - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 98.55%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 202698.55% uptime
Sep 2026100.0% uptime
100% - uptime

GN09 - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

WCDC - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime
100% - uptime

Main VM Pool (WCDC) - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

GPUs - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Secondary VM Hosts - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Xen Orchestra - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime
100% - uptime

Filer - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Archive Server - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Data Replication - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% uptime

Other Secondary Storage Systems - Operational

100% - uptime
Jul 2026 · 100.0%Aug · 100.0%Sep · 100.0%

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Jul 2026100.0% uptime
Aug 2026100.0% uptime
Sep 2026100.0% 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

Sep 2026

Delays to email forwarding from @cl/@cst to Exchange Online
  • Monitoring
    UTC
    Monitoring

    We haven't had a definitive update from Forward Email or Microsoft but email seems to be getting through reliably again as of the last few hours. We will continue to monitor.

  • Update
    UTC
    Update

    This appears to be associated with an ongoing worldwide Exchange Online incident tracked as EX1467029 and affecting many customers, and has started to be reported in the press (e.g. Cyber Security News).

  • Update
    UTC
    Update

    Our provider Forward Email has confirmed the issue and is in communication with Microsoft to resolve it.

  • Identified
    UTC
    Identified

    We are aware that email forwarded from @cl.cam.ac.uk and @cst.cam.ac.uk addresses to Exchange Online (e.g. @cam.ac.uk addresses) is currently experiencing long delays.

    We believe that this is due to Microsoft misidentifying our email forwarding platform as a source of spam. We have contacted the operator of that platform to see what they can do about this.

    No email is being lost at present (except spam), but it may be delayed by several hours. Mail sent directly to @cam.ac.uk addresses seems to be unaffected.

University firewall disruption
  • Completed
    02 September, 2026 at 07:00UTC
    Completed
    02 September, 2026 at 07:00UTC
    Maintenance has completed successfully
  • In progress
    02 September, 2026 at 03:00UTC
    In progress
    02 September, 2026 at 03:00UTC
    Maintenance is now in progress
  • Planned
    28 August, 2026 at 14:36UTC
    Planned
    28 August, 2026 at 14:36UTC

    UIS have informed us of planned disruption to the University network early on Wednesday morning. This is likely to affect internet connectivity throughout the University, some University IT systems as well as external access from the internet to departmental and University systems.

    Following network connectivity issues over last weekend, 21-23 August 2026, UIS engineers and our vendor support team will be carrying out investigations from 04:00 to 08:00 on Wednesday 2 September 2026. This work is required to conduct root cause analysis to enable us to minimise the likelihood of the fault happening again.

    It is likely that there will be some impact to University IT services during the window 04:00 to 08:00 on 2 September. We have scheduled this work at this time to try to minimise the impact, but anyone using our systems at that time may experience problems with Internet connections using the University Data Network (UDN).

    We anticipate that the system will be running as normal by 08:00. Anyone experiencing issues after that time should please contact the UIS Service Desk.

Aug 2026

Internet connectivity disrupted
  • Resolved
    UTC
    Resolved

    Update from UIS:

    We’ve moved the service to the standby firewall, and it is currently stable with no further issues observed.                                                       

    We’re continuing to investigate the underlying cause with Fortinet and will provide a further update once we have more information.

    We will close this incident now as it is no longer affecting us, but may add a further update here if we receive one.

  • Monitoring
    UTC
    Monitoring

    We observe that internet connectivity appears to be working again at the moment, though we have had no information yet from UIS so cannot guarantee that this will remain the case. The advice to work from home tomorrow still stands for now.

  • Update
    UTC
    Update

    The Departmental Silver Team has decided to recommend that you work from home tomorrow if you can.

  • Update
    UTC
    Update

    Partial connectivity (about 40%) has been restored as of 15:26.

    This remains a University-wide problem but we have had no information from UIS yet.

    If connecting from the internet into our network, only about 40% of our servers will be reachable. If you are unable to connect directly to the system you need, try going via CL VPN1, CL VPN2 or the UIS VPN. If connecting via SSH, you could try connecting via slogin or some other departmental server such as ely.

    Internet connectivity in William Gates Building offices, as well as the rest of the University including eduroam, other departments and colleges, is likely to be barely usable.

    Our main departmental website www.cst.cam.ac.uk remains accessible from the internet as it is hosted outside the University; however pages on www.cl.cam.ac.uk are affected.

  • Update
    UTC
    Update

    We observe that the University is now completely offline. This situation is beyond our control and we await UIS to repair the fault.

  • Identified
    UTC
    Identified

    We are aware that certain hosts within our network are unable to reach certain hosts on the internet.

    (Specifically, any given IP address on our network is unable to reach a different seemingly-random 15% of internet IP addresses.)

    We believe that this may be due to a malfunction or misconfiguration of the University firewall and have contacted the team in UIS responsible for this.

Jul 2026

No notices reported this month

Jul 2026 to Sep 2026

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