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Fixing Cloudflare 521 Error After Server Restart - Windows Security 0x80070424 Troubleshooting Guide-How to Fix DNS Probe Finished NXDOMAIN After Windows Update

2026-07-28 10:54:53
Fixing Cloudflare 521 Error After Server Restart - Windows Security 0x80070424 Troubleshooting Guide-How to Fix DNS Probe Finished NXDOMAIN After Windows Update

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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