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Fix Docker Nginx 502 Bad Gateway Upstream Error - Restore Windows Defender Real-Time Protection After Malware Disables It-How to Fix 'nginx configuration test failed'

Updated 2026-07-28 07:18:35security-tools

Fix Docker Nginx 502 Bad Gateway Upstream Error - Restore Windows Defender Real-Time Protection After Malware Disables It-How to Fix 'nginx configuration test failed'

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.