Home / macos-help / How to Fix Cloudflare 521 Error with Firewall Settings - npm Permission Denied on Lockfile or node_modules After Yarn-NET::ERR_CERT_AUTHORITY_INVALID in Incognito Mode: Troubleshooting

How to Fix Cloudflare 521 Error with Firewall Settings - npm Permission Denied on Lockfile or node_modules After Yarn-NET::ERR_CERT_AUTHORITY_INVALID in Incognito Mode: Troubleshooting

Updated 2026-07-29 03:43:58macos-help

How to Fix Cloudflare 521 Error with Firewall Settings - npm Permission Denied on Lockfile or node_modules After Yarn-NET::ERR_CERT_AUTHORITY_INVALID in Incognito Mode: Troubleshooting

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