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Docker Compose Environment Variable Not Set in Dockerfile - How to Fix Windows Update Stuck with Error 0x80070002-How to Resolve Cloudflare 521 on Reboot

2026-07-28 12:56:06
Docker Compose Environment Variable Not Set in Dockerfile - How to Fix Windows Update Stuck with Error 0x80070002-How to Resolve Cloudflare 521 on Reboot

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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