Sentinel experienced a major incident on December 17, 2025 affecting Sentinel Cloud, lasting 5h 38m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Dec 17, 2025, 09:59 AM UTC
We are currently having licensing communication issues with the Windows servers that is either presenting a warning message that the user will be disconnected after 60 minutes. Some users will not be able to sign in at all. We are investigating the licensing services. Users having the 60 minute disconnect warning should be able to sign in after being disconnecting.
- monitoring Dec 17, 2025, 02:16 PM UTC
We have identified the a fault which we ran a repair. We have not been able to replicate the error and are now monitoring the issue to be sure licensing is working correctly across all servers.
- resolved Dec 17, 2025, 03:37 PM UTC
This issue has been confirmed resolved. If there are any further service issues please get in contact with our support.