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Fix Windows 11 Update Stuck at 0% with Service Not Running - Cloudflare 521 Error During Setup – How to Resolve-Fix Docker Compose 'port 8080 already allocated' Error

Updated 2026-07-28 06:37:26developer-tools

Fix Windows 11 Update Stuck at 0% with Service Not Running - Cloudflare 521 Error During Setup – How to Resolve-Fix Docker Compose 'port 8080 already allocated' Error

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.