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dnsServer•errorerrorlocksslcodecURLsettingsserver_configuration•labelCommon•warningModerate

cURL error 35: SSL connect error

This error occurs when the cURL library fails to complete the TLS handshake with a remote server. The failure usually stems from mismatched protocol versions, missing certificate authority data, or outdated cryptographic libraries.

The result is a broken HTTPS request while the rest of the site continues to load normally.

Symptoms

[dashicons-warning]
Error shown in admin
WordPress admin displays cURL error 35 SSL connect error in logs or plugin screens.
[dashicons-email]
Emails do not send
Mail services report connection failure and no messages leave the site.
[dashicons-clock]
WP‑Cron stops
Scheduled tasks that rely on external HTTPS endpoints never run.

Common Causes

Out‑of‑date libraries
cURL, OpenSSL or PHP versions lack support for required TLS protocol or cipher suite.
Missing CA bundle
cURL fails to verify remote certificate chain because CA certificates are absent or outdated.
Firewall blocks outbound HTTPS
Server firewall or security module resets TLS handshake on port 443.
TLS version mismatch
Remote service forces TLS 1.2/1.3 while local client only offers older versions.
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