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#1520 Docs: document macOS TLS trust limitation and SSL_CERT_FILE workaround

Opened by stack72 · 8/3/2026· Shipped 8/3/2026

Issue 1518 identified that Deno DENO_TLS_CA_STORE=system on macOS does not use the OS full certificate trust evaluation. Root CAs distributed via Apple OTA trust updates are not recognized, causing UnknownIssuer errors for valid certificates that curl and browsers accept. This is a known Deno limitation (denoland/deno#36402). The tls-and-proxies.md manual page should document the limitation and the SSL_CERT_FILE workaround.

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8/3/2026, 11:55:36 PM

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03Sludge Pulse
stack72 assigned stack728/3/2026, 11:18:07 PM
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stack72 commented 8/3/2026, 9:46:34 PM

Note: the docs should clarify that SSL_CERT_FILE is additive — swamp merges the certificates from that PEM file with the existing system and Mozilla trust stores (via DENO_TLS_CA_STORE=system,mozilla). Setting SSL_CERT_FILE does not replace the default trust stores, it adds to them.

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