Outage report · Major outage

Harness outage on Sep 14, 2026

MTLS Outage with Delegates

SeverityMajor outage

StartedSep 14, 2026, 19:00UTC

ResolvedSep 15, 2026, 03:28UTC

Duration8h 28m

What happened

Harness reported a major outage starting Sep 14, 2026, 19:00 UTC, affecting Continuous Delivery - Next Generation (CDNG), Continuous Delivery - Next Generation (CDNG), Continuous Delivery - Next Generation (CDNG). It was marked resolved at Sep 15, 2026, 03:28 UTC.

The incident lasted 8h 28m from first report to resolution.
It was the longest significant outage Harness reported in the 12 months up to it.
Harness had reported 2 other partial or major outages in the 90 days before it.
7 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Harness

# **Summary** To improve the security posture, On September 14, 2026, Harness performed a scheduled rotation of the TLS certificate used to secure Delegate connections for accounts using mutual TLS \(mTLS\),The replacement certificate passed Harness's existing pre-deployment validation and smoke testing. However, the rotation also introduced a change in certificate authority, which required additional certificate-chain and gateway configuration this prevented affected Delegates from connecting to Harness. Harness has identified the contributing factors and is implementing the corrective actions described below to prevent a recurrence. # **Impact** Delegates configured to use mutual TLS in Prod environment were unable to connect to Harness for until Harness applied a temporary mitigation \(disabling mTLS\) that restored connectivity while the underlying issue was corrected. This affected the ability to run pipelines and other operations dependent on the affected Del

Read Harness's official incident report ↗