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Outage in Imperva

[INC-1135] Service Degradation Causing Intermittent DNS Resolution Issues

Resolved Minor
September 17, 2026 - Started 2 days ago - Lasted about 5 hours
Official incident page

Incident Report

We are currently investigating an issue that may cause intermittent DNS resolution failures for some customers. Our teams are actively investigating the issue and working to identify the cause and restore consistent DNS resolution. We will provide further updates as more information becomes available.

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Latest Updates ( sorted recent to last )
RESOLVED 2 days ago - at 09/18/2026 12:09AM

The services are now stable, and the issue has been fully mitigated. Post-mitigation validation has been completed, confirming that the services are operating as expected.
The incident is now considered resolved.

MONITORING 2 days ago - at 09/17/2026 10:04PM

The team has completed the mitigation, and the affected services have been validated to be operating as expected.
We will continue to closely monitor the service to ensure the fix remains effective and services remains stable.

IDENTIFIED 2 days ago - at 09/17/2026 09:34PM

Mitigation and validation efforts remain ongoing. The team continues to apply the targeted fix to the remaining affected systems while closely monitoring the service and validating recovery.
The next update on the issue will be shared no later than 22:05 UTC.

IDENTIFIED 2 days ago - at 09/17/2026 08:55PM

Mitigation and validation efforts are continuing. The team is closely monitoring the service while applying the targeted fix across the remaining affected systems and validating recovery.
The next update on the issue will be shared no later than 21:25 UTC.

IDENTIFIED 2 days ago - at 09/17/2026 08:24PM

Mitigation efforts are continuing. We are seeing recovery as the targeted fix is progressively applied to the affected services.
The next update on the issue will be shared no later than 20:55 UTC.

IDENTIFIED 2 days ago - at 09/17/2026 07:50PM

The issue has been identified, and our teams have confirmed the cause of the intermittent DNS resolution failures.
The team is currently applying the mitigation in a controlled manner across the affected services.
The issue remains intermittent and limited in scope.
The next update on the issue will be shared no later that 20:20 UTC.

INVESTIGATING 2 days ago - at 09/17/2026 07:39PM

We continue to investigate intermittent DNS resolution issues that may affect a small number of requests.
The issue is highly intermittent and remains limited in scope. Our teams are actively investigating the issue and working to identify the cause and ensure consistent DNS resolution.
The next update on this issue will be shared no later than 20:10 UTC.

INVESTIGATING 2 days ago - at 09/17/2026 06:57PM

We are currently investigating an issue that may cause intermittent DNS resolution failures for some customers.
Our teams are actively investigating the issue and working to identify the cause and restore consistent DNS resolution.
We will provide further updates as more information becomes available.

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