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Fix Edge Sync Not Syncing History - Troubleshooting Nginx Upstream Connection Refused 443-How to Resolve Error 521 Web Server Down

2026-07-28 11:49:41
Fix Edge Sync Not Syncing History - Troubleshooting Nginx Upstream Connection Refused 443-How to Resolve Error 521 Web Server Down

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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