Cisco CES Outage History

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Cisco CES had 5 outages in the last 2 years totaling 400h 42m of downtime — averaging 0.2 incidents per month.

There were 5 Cisco CES outages since January 22, 2026 totaling 400h 42m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.ces.cisco.com

Minor August 21, 2026

Service Degradation In Attachment Analysis - EU region

Detected by Pingoru
Aug 21, 2026, 07:44 AM UTC
Resolved
Aug 21, 2026, 11:01 AM UTC
Duration
3h 17m
Timeline · 3 updates
  1. investigating Aug 21, 2026, 07:44 AM UTC

    We are currently experiencing service degradation in attachment analysis in EU region. ESA/CES deployments uploading attachments to EU Secure Malware Analytics may experience attachment analysis and email processing delays. The team is investigating the issue and working to restore normal service as soon as possible.

  2. monitoring Aug 21, 2026, 11:01 AM UTC

    We have implemented a fix for the attachment analysis degradation in the Europe region. Our team is now monitoring the results to ensure stability. Normal email processing is currently resuming. We will provide further updates as they become available.

  3. resolved Aug 21, 2026, 11:01 AM UTC

    The attachment analysis issue in the Europe region is now resolved, services have returned to normal. Our teams have confirmed that all systems are healthy. Thank you for your patience.

Read the full incident report →

Notice June 1, 2026

SafeUnsubscribe Service Outage

Detected by Pingoru
Jun 01, 2026, 02:00 AM UTC
Resolved
Jun 01, 2026, 12:35 PM UTC
Duration
10h 35m
Timeline · 2 updates
  1. monitoring Jun 01, 2026, 02:00 AM UTC

    A fix for the SafeUnsubscribe (suproxy) service outage has been implemented. Our teams are currently monitoring the service to ensure stability and to verify that the HTTP 502 errors have been fully mitigated. We will provide a final update once monitoring is complete and normal service has been confirmed.

  2. resolved Jun 01, 2026, 12:35 PM UTC

    The service outage affecting the SafeUnsubscribe service (suproxy) has been resolved. Core operations are fully restored and functioning as expected. Any remaining minor issues are being managed separately and do not impact core service functionality. We apologize for the inconvenience this may have caused and appreciate your patience.

Read the full incident report →

Major March 19, 2026

DNS outage

Detected by Pingoru
Mar 19, 2026, 11:30 AM UTC
Resolved
Mar 19, 2026, 07:04 PM UTC
Duration
7h 34m
Timeline · 5 updates
  1. investigating Mar 19, 2026, 11:30 AM UTC

    We are seeing DNS outage in Europe region affecting multiple services on email security appliances. Team is actively working to fix it

  2. investigating Mar 19, 2026, 12:12 PM UTC

    We are continuing to investigate a DNS outage in the Europe region. Progress is ongoing to restore normal operations, and updates will be provided as more information becomes available.

  3. monitoring Mar 19, 2026, 12:24 PM UTC

    The fix has been implemented and we are monitoring the results.

  4. monitoring Mar 19, 2026, 01:33 PM UTC

    All CES services in the Europe region are currently stable. We are continuing to monitor our systems to ensure ongoing performance and reliability. Further updates will be provided as needed. Thank you for your patience and understanding.

  5. resolved Mar 19, 2026, 07:04 PM UTC

    The DNS-related issue affecting Cloud Email Security (CES) services in the Europe region has been fully resolved. All services are operating normally, and system stability has been confirmed. If you have any questions, please contact Cisco TAC: http://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

Read the full incident report →

Minor January 22, 2026

Secure Email Incident - O365 Service Degradation - 2026-01-22

Detected by Pingoru
Jan 22, 2026, 09:15 PM UTC
Resolved
Jan 23, 2026, 06:01 AM UTC
Duration
8h 46m
Affected: Others/General Maintenance
Timeline · 2 updates
  1. monitoring Jan 22, 2026, 09:15 PM UTC

    What : Microsoft is currently experiencing service degradation within their Office 365 (O365) environment. For the latest updates, please visit: https://status.cloud.microsoft/ Impact Details : Customers may observe a backlog of active email recipients pending delivery to O365. Problem Symptoms : Delays or queuing of email recipients pending delivery to O365. Workaround/Solution : There is no workaround or solution available at this time. Recommendations : We are actively monitoring updates from Microsoft and will continue to provide timely information as the situation evolves. There is no need to contact us regarding this incident. We will proactively communicate any significant changes or resolutions to our customers. If you have any urgent questions about this incident or the possible impact, please get in touch with Cisco TAC: http://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

  2. resolved Jan 23, 2026, 06:01 AM UTC

    As of Jan 23rd 2026 5:32:25 AM UTC, Microsoft has confirmed that Exchange Online mail flow is resolved and remains stable.

Read the full incident report →