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Fix Nginx Upstream Connection Refused Socket Error - Resolve Cloudflare 521 Error on Wildcard Domains-Ubuntu pip install Permission Denied – Quick Fixes

2026-07-28 10:23:24
Fix Nginx Upstream Connection Refused Socket Error - Resolve Cloudflare 521 Error on Wildcard Domains-Ubuntu pip install Permission Denied – Quick Fixes

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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