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How to Fix Nginx 'Upstream Connection Refused' Error - Troubleshoot Nginx Redirect Loop 302-Docker Socket Permission Issues Causing Nginx 502

2026-07-28 09:58:45
How to Fix Nginx 'Upstream Connection Refused' Error - Troubleshoot Nginx Redirect Loop 302-Docker Socket Permission Issues Causing Nginx 502

Result check

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

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