Outage in Pantheon

403 errors in Composer-Related Workflows

Resolved Minor
September 15, 2025 - Started about 16 hours ago - Lasted about 4 hours
Official incident page

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Outage Details

We are currently investigating reports of Composer-related workflow failures on Drupal sites. This impacts multiple workflows, including creating new sites or environments and code deployments. We will provide another update within the next hour or sooner if additional information becomes available.
Components affected
Pantheon Spinup Operations Pantheon Terminus Operations Pantheon Workflow Operations Pantheon Dashboard
Latest Updates ( sorted recent to last )
RESOLVED about 12 hours ago - at 09/15/2025 02:12PM

This incident has been resolved.

MONITORING about 13 hours ago - at 09/15/2025 12:28PM

A fix has been implemented and we are monitoring the results.

Affected sites may retry any failed deployments or workflows. If the issue persists, please contact Support for additional assistance.

IDENTIFIED about 15 hours ago - at 09/15/2025 11:12AM

The issue has been identified and a fix is being implemented.

We will provide another update as soon as more information becomes available.

INVESTIGATING about 16 hours ago - at 09/15/2025 09:53AM

We are currently investigating reports of Composer-related workflow failures on Drupal sites. This impacts multiple workflows, including creating new sites or environments and code deployments.

We will provide another update within the next hour or sooner if additional information becomes available.

Latest Pantheon outages

Degraded Git Operations And Deployment Workflows - about 5 hours ago
Degraded Dashboard Service - 5 days ago
Intermittent Code Deployment and Workflow issues - 8 days ago
Salesloft Drift Security Incident: Pantheon Response - 10 days ago
Dashboard Performance Issues - 13 days ago

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