Home / developer-tools / Fix npm run build Exit Code 1: Common Causes and Solutions - How to Resolve Certificate Authority Invalid in Chrome-Resolve 521 Web Server Down with Firewall Changes

Fix npm run build Exit Code 1: Common Causes and Solutions - How to Resolve Certificate Authority Invalid in Chrome-Resolve 521 Web Server Down with Firewall Changes

Updated 2026-07-28 08:27:43developer-tools

Fix npm run build Exit Code 1: Common Causes and Solutions - How to Resolve Certificate Authority Invalid in Chrome-Resolve 521 Web Server Down with Firewall Changes

Likely symptom

Likely cause

Safe rollback

Verification route

Repeat the original action, not only a simplified test case.
Restart the app or reload the service after configuration changes.