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Fix Nginx Upstream Connection Refused Error - Docker Nginx 502: How to Diagnose and Fix Memory Limit Issues-Node Sass Build Failure: Node Version Mismatch Fix

Updated 2026-07-28 11:02:29office-tools

Fix Nginx Upstream Connection Refused Error - Docker Nginx 502: How to Diagnose and Fix Memory Limit Issues-Node Sass Build Failure: Node Version Mismatch Fix

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.