Sentinel experienced a major incident on June 7, 2026 affecting Sentinel Cloud, lasting 10d 7h. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- identified Jun 07, 2026, 09:14 AM UTC
The issue has been identified and a fix is being implemented.
- identified Jun 07, 2026, 06:33 PM UTC
We are continuing to work on a fix for this issue.
- monitoring Jun 07, 2026, 06:33 PM UTC
A fix has been implemented and we are monitoring the results.
- monitoring Jun 08, 2026, 12:45 PM UTC
The intermittent connectivity observed over the weekend, 06/06/26 – 07/06/26 which caused some loss of connectivity to the Sentinel Cloud has been confirmed to be a Distributed Denial of Service (DDoS) attack. Fortunately, our Out of Hours team identified the problem quickly and managed to stop the attack. The external attack has come from a foreign nation whose intent is believed to disrupt UK business operations. Our Secure Internet Firewalls managed to fend off the threat until it was understood and suppressed. We’ll continue to monitor environment and provide further updates if necessary. This forms a stern reminder that security must be a priority and not a ‘nice-to-have’. Sentinel maintains our Cyber Essentials Plus certification which ensures that we’re ahead of potential threats. Please speak to your account manager or the Sentinel Support desk for further information.
- resolved Jun 17, 2026, 04:59 PM UTC
This incident has been resolved.