Amsterdam (AER) DC outage

Update timeline

1. investigating May 07, 2026, 08:00 AM UTC

   We are currently investigating a critical issue affecting connectivity for customers served by the AER (secondary) DC. Appliances, affecting ESA, in this data center are currently down, Emails in primary DC is working fine and processing emails. Preliminary information from one ISP suggests there may have been an incident at the location. We are working urgently to assess the situation and restore service as quickly as possible. Further updates will be provided as more information becomes available.

2. identified May 07, 2026, 12:56 PM UTC

   Our mitigation steps are currently in progress to address the outage at the Amsterdam (AER) secondary data center. The primary data center remains fully operational and continues processing emails as expected. We will provide further updates as more information becomes available. Thank you for your patience and understanding.

3. identified May 07, 2026, 01:50 PM UTC

   We are continuing to implement mitigation steps to address the outage at the Amsterdam (AER) secondary data center. Efforts are underway to add additional capacity in the Frankfurt data center to help restore impacted services. The primary data center remains fully operational and continues to process emails as expected. We will provide further updates as more information becomes available. Thank you for your patience and understanding.

4. identified May 07, 2026, 04:28 PM UTC

   Restoration activities remain in progress, and some customers may continue to experience delays in email processing. We are actively working with impacted customers to provide support and mitigation options.The primary data center remains fully operational and continues to process emails as expected.

5. identified May 07, 2026, 08:11 PM UTC

   Restoration activities are ongoing, and some customers might still experience delays in email processing. We are diligently collaborating with affected customers to offer support and mitigation solutions. The primary data center remains fully operational and continues to handle email processing as usual. Further updates will be provided as they become available.

6. identified May 08, 2026, 12:12 AM UTC

   Restoration activities remain ongoing, and some customers may continue to experience delays in email processing. Our teams are actively assessing the impacted data center and working to restore full service functionality as quickly as possible. The primary data center remains fully operational and continues processing email traffic normally. Additional updates will be provided as more information becomes available.

7. identified May 08, 2026, 04:12 AM UTC

   Restoration efforts are still in progress, and some customers may continue to encounter delays with email processing. Our teams are evaluating the affected data center and working diligently to restore all service functionality via the primary data centre. The primary data center is fully operational and continues to handle email traffic . We will share further updates as new information arises.

8. identified May 08, 2026, 08:59 AM UTC

   The restoration work is ongoing, and some customers may still notice delays in email processing. Our teams continue to focus on the affected data center to expedite the return to full service. We will provide additional updates as soon as we have more information.

9. identified May 08, 2026, 02:53 PM UTC

   The restoration activities are still in progress, and some customers may continue to experience delays in email processing. Our teams remain actively engaged with the affected data center to accelerate the restoration of full service. We will continue to provide updates as additional information becomes available.

10. identified May 08, 2026, 05:04 PM UTC

    The restoration activities are still ongoing, and some customers may continue to experience delays in email processing. Our teams remain actively engaged with the affected data center and are working to restore full service as quickly as possible. We will continue to share updates as more information becomes available.

11. identified May 08, 2026, 09:52 PM UTC

    Restoration efforts are ongoing, and some customers may continue to experience intermittent delays in email processing. Our teams continue to work actively to restore full service. The next update will be provided on May 11 at 15:00 UTC.

12. identified May 11, 2026, 03:02 PM UTC

    Recovery efforts are actively ongoing, and our Operations and Engineering teams remain highly focused on restoring full service functionality as quickly and safely as possible. Based on current assessments of restoration progress, our estimated timeline for full recovery is tentatively targeted for later this week. We will continue to provide updates as additional information becomes available, and we appreciate your continued patience and partnership.

13. identified May 11, 2026, 11:08 PM UTC

    Recovery efforts at the Amsterdam (AER) secondary data center are actively ongoing, and our Operations and Engineering teams remain highly focused on restoring service functionality. Based on current assessments, our estimated timeline for full recovery of the AER data center remains tentatively targeted for later this week, contingent upon the successful restoration of power at the facility. While recovery efforts continue, some customers may observe the following expected behaviors within their environment: • Configuration Synchronization Errors: Customers may encounter errors when making administrative configuration changes. This occurs because the active nodes are attempting to synchronize configurations with the offline site. This is normal behavior and can be safely ignored. Once service is fully restored, the cluster will automatically re-sync all configuration changes. • Upstream MTA Connection Errors: Upstream Mail Transfer Agents (MTAs) may log connection errors when attempting to route traffic to the offline data center. However, based on standard SMTP and DNS MX record lookup sequences, customer MTAs should automatically failover and route traffic to the operational data center. Customers who require immediate assistance or have further questions should reach out to Cisco Support. We appreciate your continued patience and understanding.

14. identified May 13, 2026, 04:25 PM UTC

    Power has been successfully restored to the Amsterdam (AER) data center facility, and our teams remain focused on restoring services to normal functionality. The estimated timeline for full recovery remains tentatively targeted for later this week. We will continue to provide updates as more information becomes available.

15. identified May 13, 2026, 08:46 PM UTC

    To help ensure a safe and stable recovery, Cisco Cloud Email Security (CES) Operations and Engineering teams are bringing up CES systems and infrastructure in a carefully phased approach. This deliberate sequence is designed to help minimize operational risk, ensure infrastructure stability, and safely restore full-service functionality. Startin g at 22:00 UTC, CES Operations and Engineering teams will begin a phased process to bring o utbound email processing online from the Amsterdam (AER) secondary datacenter. Inbound email processing will be restored in a subsequent phase to be communicated in a future status update. While these recovery efforts continue, some customers may observe the following expected behaviors within their environment : Configuration Synchronization Errors: Customers may encounter errors when making administrative configuration changes. This occurs because the active nodes are attempting to synchronize configurations with the offline site. This is normal behavior and can be safely ignored. Once service is fully restored, the cluster will automatically re-sync all configuration changes. Mail Routing and Upstream MTA Connection Errors: Upstream Mail Transfer Agents (MTAs) may log connection errors when attempting to route traffic to the offline data center. However, based on standard SMTP and DNS MX record lookup sequences, customer MTAs should automatically failover and route traffic to the operational data center. Bounce notifications (NDRs): As services continue to recover and message processing resumes, some customers may observe delayed messages being returned or bounced. In certain cases, messages that have remained queued for more than 72 hours may exceed retry or expiration of thresholds defined by sending systems or downstream mail servers. We recommend customers review any critical email traffic that may require retransmission once normal processing has been fully restored. Our teams are closely monitoring the environment as systems come back online. We will provide another update once the power-up sequence is complete, and services have been fully validated. Customers who require immediate assistance or have further questions should reach out to Cisco Support. We appreciate your continued patience and understanding.

16. identified May 14, 2026, 01:43 AM UTC

    Inbound and outbound email processing services are expected to begin coming back online progressively over the next few hours as restoration activities continue. Engineering and Operations teams are actively monitoring the environment throughout the recovery process.

17. monitoring May 14, 2026, 03:21 AM UTC

    Power restoration and recovery sequence at our Amsterdam (AMS) data center has been successfully completed. The facility is now online, and all affected Cloud Email Security (CES) services have been restored and are actively processing email traffic. Our Operations and Engineering teams will continue to closely monitor the environment to ensure sustained infrastructure stability and optimal performance. We sincerely appreciate your patience throughout this recovery process. If you observe any unexpected behavior or require immediate technical assistance, please open a service request with Cisco TAC Support.

18. identified May 18, 2026, 06:33 PM UTC

    Cisco Secure Email Cloud Gateway (CES) experienced a connectivity issue which impacted email processing through the Amsterdam (AMS) data center following a temporary power disruption at the facility. Email processing within the primary (Frankfurt) data center remains operational and continues to process mail traffic normally. Customers may experience intermittent connection failures or temporary message processing delays while CES validates service restoration. Further updates will be provided as more information becomes available. For customers who require immediate assistance, please contact Cisco TAC for support.

19. monitoring May 18, 2026, 10:43 PM UTC

    Following a brief power disruption at approximately 16:20 UTC at the Amsterdam (AMS) data center, validation of Cisco Secure Email Cloud Gateway (CES) service recovery is complete, and all affected services are fully restored. CES services remain functional and online while the data center provider continues ongoing power maintenance at the AMS facility. No service disruption is expected. Traffic is processing normally, and our teams continue to closely monitor the environment to ensure sustained stability. We sincerely appreciate your patience throughout this recovery process. If you observe any unexpected behavior or require immediate technical assistance, please open a service request with Cisco TAC Support.

20. monitoring May 20, 2026, 08:40 PM UTC

    Please be advised that scheduled network maintenance is planned for Tomorrow May 21, 2026 at 5:00 PM UTC to ensure the continued stability and optimal performance of our infrastructure. While we do not anticipate any service disruptions, you may observe brief periods of network convergence or minor connectivity fluctuations during this window. Our engineering teams will actively monitor the environment throughout the process, and we will provide a follow-up notification once the maintenance activities have been successfully completed.

21. resolved May 22, 2026, 06:28 PM UTC

    We are pleased to inform you that the incident affecting the Amsterdam (AMS) secondary data center has been resolved. Our engineering and operations teams have successfully completed the controlled power-up sequence, network stabilization, and post-recovery health checks, ensuring that all Cloud Email Security (CES) services are restored and processing traffic normally. We have verified system stability across the environment and returned to standard operations. We sincerely appreciate your patience and partnership throughout this recovery process; should you experience any lingering issues, please contact Cisco TAC for support.