Critical incident

Anaplan: Platform Alerts

Affected: us1: Data Center - US East, us2: Data Center - US West, eu1: Data Center - Netherlands, eu2: Data Center - Germany, eu4: Cloud - Europe, us5: Cloud - US East, ap1: Cloud - Japan, us7: Cloud - US

Current status of Anaplan: Operational — live Anaplan status

Timeline

1. Jun 11, 2026, 04:32 UTC
   investigating
   We are currently investigating an issue impacting customers’ ability to access the Anaplan Platform. We are working to resolve this issue as quickly as possible and will provide updates every 30 minutes or upon resolution.
2. Jun 11, 2026, 04:58 UTC
   investigating
   Thank you for your patience as we continue to investigate this issue. Currently, we do not yet have a time to resolution. We will continue to provide updates every 30 minutes as we work to resolve this issue as quickly as possible.
3. Jun 11, 2026, 05:03 UTC
   identified
   The symptoms currently being observed are similar to the platform issue experienced earlier today. Our engineering and operations teams have been immediately mobilized and are actively diagnosing the root cause. We treat any recurrence with the utmost urgency and priority. We sincerely apologize for this disruption, we treat any recurrence with the utmost urgency and priority. We will provide another update in 30 minutes, or sooner as we obtain more actionable technical details.
4. Jun 11, 2026, 05:25 UTC
   identified
   We are beginning to see signs of platform recovery, and primary services are starting to stabilize. As systems come back online, a backlog of queued CloudWorks jobs has accumulated and is currently processing. Our engineering teams are closely monitoring the stability of the platform and tracking the queue clearance velocity. We will provide our next update in 30 minutes, or sooner as we confirm continued stability.
5. Jun 11, 2026, 05:44 UTC
   monitoring
   The platform has successfully recovered and is exhibiting stable performance. We are now focused on clearing the accumulated backlog of CloudWorks jobs. Our engineering teams are actively managing and verifying the processing queue to ensure all delayed jobs complete as quickly and safely as possible. We will continue to supervise the queue clearance and will provide our next update in 30 minutes, or sooner as we approach full restoration. If you have any questions, concerns, or continue to experience issues, please do not hesitate to contact Anaplan Support. We will provide a final update to you when we consider this situation fully resolved.
6. Jun 11, 2026, 06:14 UTC
   monitoring
   The platform remains stable and fully operational. We are continuing to process the remaining backlog of CloudWorks jobs. Our engineering teams are actively overseeing the processing queues to ensure all jobs complete successfully and system performance remains steady. We appreciate your continued patience as we work through this remaining queue. We will provide our next update in 30 minutes, or sooner as queue clearance nears completion.
7. Jun 11, 2026, 06:30 UTC
   monitoring
   Service has now been restored; you should now be able to resume normal activities. We will continue to monitor the platform to ensure no additional issues arise. If you have any questions, concerns, or continue to experience issues, please do not hesitate to contact Anaplan Support. We will provide a final update to you when we consider this situation fully resolved.
8. Jun 11, 2026, 11:05 UTC
   monitoring
   We want to keep you informed with the latest update on the service disruption affecting our platform. What we've done We have identified the source of the instability and are actively working to resolve it. Our engineering team, in collaboration with our vendor, has already implemented a configuration change that has reduced the frequency of errors. We are monitoring the platform closely and have seen improvement as a result. We are aware that some customers are experiencing delays and interruptions with their CloudWorks integrations as a direct result of this incident. Our engineering team is actively identifying and resolving any affected integration jobs. Current status The platform is operational. Integration processing is being actively monitored and remediated. We will not consider this incident closed until we are fully satisfied that the platform is stable, all integration jobs are running normally, and the risk of recurrence has been addressed. We will now provide updates every 2 hours, as our investigation progresses and we work with our Vendor. We understand the impact this has had on your operations and we appreciate your patience.
9. Jun 11, 2026, 14:01 UTC
   monitoring
   We want to keep you informed with the latest update on the service disruption affecting our platform. After collaboration with our Vendor, we have identified two fixes to our underlying infrastructure. The first fix has now been implemented successfully without further disruption and initial monitoring is proving positive. We are continuing to liaise with our Vendor for the secondary fix, to ensure no further disruption is caused. The platform remains stable and all Cloudworks integrations are working as expected and the backlog has been cleared. The incident will remain open and we will provide updates every 2 hours or sooner, as we continue to investigate and have full resolution. We understand the impact this has had on your operations and we appreciate your patience
10. Jun 11, 2026, 14:31 UTC
    resolved
    We want to provide you with the latest update regarding the recent service disruption affecting our platform. All agreed-upon fixes have been successfully implemented across our underlying infrastructure. Our ongoing monitoring shows that system performance remains stable and positive. Our engineering teams will continue to monitor the platform closely to ensure continued stability. Additionally, we are conducting thorough Root Cause Analysis (RCA) and this will be provided within 7 business days. We sincerely understand the impact this disruption has had on your daily operations, and we deeply appreciate your patience and continued partnership as we work to ensure a reliable experience.
11. Jun 19, 2026, 15:02 UTC
    postmortem
    **June 8–12, 2026 Platform Disruptions** On June 8, 2026, at 11:05 UTC, our monitoring detected a brief drop in incoming traffic across the Anaplan platform, with automated monitoring checks failing across all affected regions \(us1: Data Center - US East, us2: Data Center - US West, eu1: Data Center - Netherlands, eu2: Data Center - Germany, eu4: Cloud - Europe, us5: Cloud - US East, us7: Cloud - US, and ap1: Cloud - Japan\). Over the four days, a series of related disruptions affected the same regions. Customers experienced intermittent difficulties logging in, opening models, and running integrations. The platform was fully stabilized on June 11, 2026, at 18:12 UTC. These disruptions are linked to our previously communicated infrastructure modernization program. On the weekend of June 6, we migrated our control plane, the part of the platform that directs how traffic is routed between services. This was the most complex of the planned migration weekends, and it was completed successfully, as had the two previous migration weekends. The issues described in this report emerged in the days following that migration. This report covers the seven linked incidents that occurred between June 8 and June 11, 2026. **Root cause** As part of our infrastructure modernization program, on the weekend of June 6, we completed a successful migration of our control plane. In the days that followed, we observed two discrete network-hardware issues that interacted to drive these disruptions. _Issue 1: Media Access Control \(MAC\) flapping \(June 8–9\)_ Every device on a network has a MAC address, a unique hardware identifier that network switches use to route traffic to the correct destination. In our environment, the MAC addresses involved are virtual — assigned to logical network gateways rather than to fixed physical hardware — which allows them to legitimately move between hosts as part of normal operation. MAC flapping occurs when a switch sees the same MAC address appearing on two different physical ports in rapid succession, forcing it repeatedly to update its routing tables. This briefly slows or interrupts traffic. For customers, this surfaced as a brief, self-recovering instability. Short bursts of load and intermittent errors appeared and cleared on their own within minutes. The trigger for this behavior was the specific way live production traffic interacted with the new post-migration network. To resolve the issue, we scaled capacity, engaged our vendor, and deployed configuration changes to contain the impact. _Issue 2: network card driver defect \(June 10–11\)_ Once the first set of mitigations were in place, we identified a second issue: A defect in the network card driver, which is the software that controls how a network card sends and receives data. The defect affected fewer than 0.005% of the cards in our estate. Those cards failed randomly and unpredictably, dropping traffic while still appearing healthy to our monitoring systems. This is known as a "gray failure" condition, because the affected components don’t flag themselves as broken. The cards sat in the part of the network that routes traffic between the regions impacted. This resulted in failures that cascaded across the platform and drove disruptions on June 10 and June 11. The defect hadn't been observed in previous migrations or in any other environment, and there were no indicators in pre-deployment testing. The gray failure pattern was also what initially masked the defect as a load issue, until further investigation pointed us to the driver itself. We engaged our vendor, who confirmed the defect. Working closely with them, we rapidly prepared, tested, and deployed the patch to the affected hosts on the evening of June 11, UTC. After that, the platform stabilized. **Recovery** From the first occurrence on June 8 through to permanent resolution on June 11, our engineering team led a continuous, round-the-clock response, working closely with our vendo

Updates as published by Anaplan (original).