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infoWordPress Core•apiREST APIhourglass_bottomTimeoutdnsDNSerrorcURL error 28•labelCommon•warningModerate

cURL error 28: Operation timed out after 30001 ms with 0 out of -1 bytes received

The error appears when WordPress tries to reach an external URL and the request does not finish within the default 30‑second window. The cURL library aborts the connection and returns error 28, indicating a timeout with no data received.

Typical triggers include blocked outbound traffic, slow DNS resolution, remote server overload, low PHP timeout settings, or SSL/TLS handshake problems. The result is a broken REST API, failed updates, and stalled external integrations.

Symptoms

[dashicons-warning]
Admin dashboard error
Site Health shows REST API error with cURL error 28
[dashicons-admin-plugins]
Failed updates
Core, plugins, or themes cannot be installed or updated
[dashicons-admin-network]
External API failure
Payment gateways or licensing servers stop responding
[dashicons-clock]
Cron jobs stop
Scheduled tasks never run and log cURL error 28

Common Causes

Network blocks
Firewall or security plugin blocks outbound HTTP requests
DNS problems
Slow or mis‑configured DNS prevents host resolution
Remote server latency
Target API takes longer than default timeout
PHP/cURL limits
Low default_socket_timeout or low CURLOPT_TIMEOUT set by code
SSL/TLS handshake
Mismatched TLS version or missing CA bundle stalls connection
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