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Fix Windows 11 Installation Assistant Stuck at 99% - How to Resolve Cloudflare 521 from Server Overload-How to Fix Docker Nginx 502 Bad Gateway with MySQL

2026-07-28 05:42:21
Fix Windows 11 Installation Assistant Stuck at 99% - How to Resolve Cloudflare 521 from Server Overload-How to Fix Docker Nginx 502 Bad Gateway with MySQL

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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