Introduction
The cURL 52 error means that your server received an "empty reply". In technical terms: a connection was established between your server and a remote server, but no data was transmitted before the connection was closed.
Just like the cURL 28 error, the solution for this error almost always lies within your hosting configuration rather than the plugin itself.
Problem
You can recognize this issue by the following message in your logs or dashboard:
curl: (52) Empty reply from the server.
This often happens when a request is sent, but the remote server (or your own server) closes the connection immediately without sending any information back.
How to solve
Since the cause is server-related, you should have your hosting provider perform the following steps:
Update libcurl: Check if the server is using an outdated version of libcurl. Updating to the latest version often resolves this.
Check the Firewall: Ensure the firewall is not blocking requests and that protocols like HTTP and HTTPS are correctly allowed.
Use HTTPS: Check if cURL is trying to connect via HTTP while the server expects HTTPS.
Alternate WP Cron: If the error affects your scheduled actions, add the following code to your
wp-config.phpfile:define('ALTERNATE_WP_CRON', true);Port Settings: Are you using a specific port in the URL? Try using a different port or check if the current port is open.
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