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Nginx Upstream Connection Refused: Diagnosis and Fixes - Troubleshooting Cloudflare 522: Origin Server Checks-Troubleshooting Node.js Heap Out of Memory with PM2

2026-07-28 14:49:38
Nginx Upstream Connection Refused: Diagnosis and Fixes - Troubleshooting Cloudflare 522: Origin Server Checks-Troubleshooting Node.js Heap Out of Memory with PM2

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

Next references

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