Outage in Salesforce
Heroku service degradation
Resolved Minor
August 25, 2026 - Started about 6 hours ago
- Lasted about 1 hour
Incident Report
Summary AI Generated
Heroku's Common Runtime applications in the EU region experienced TLS handshake failures after a security update unintentionally enforced stricter TLS certificate policies for app default domains (`<app>.herokuapp.com`), preventing some clients from connecting to their apps. The incident lasted approximately 1.2 hours, causing intermittent connectivity issues, timeouts, and degraded performance. Engineers identified the root cause and worked to remediate the misconfigured policy.
We are aware of a performance degradation that may impact customers, and are actively working to resolve user impact. During a performance degradation users can access the service, but some functionality can be intermittently unavailable or operate less than optimal performance. General and intermittent slow performance, timeouts, and connectivity issues are possible. We’ll provide an update in 60 minutes or sooner if additional information becomes available.
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Latest Updates ( sorted recent to last )
UPDATE
about 6 hours ago - at 08/25/2026 03:40PM
A recent security update for Common Runtime applications in the EU region may have unintentionally enforced a stricter policy for TLS certificates used for app default domain TLS termination (.herokuapp.com). This caused some clients to experience TLS handshake failures and to be unable to connect to apps. Engineers have identified the issue and we are working on remediating.
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