Error connecting to MailChimp: SSL certificate problem:

Hey all,

Do you happen to know which versions of PHP CURL you’re all running? Most likely, asking your host to update it to a more recent version will get rid of the issue automagically.

Alternatively, add the following code to your site as a (temporary) workaround.

add_filter( 'http_request_args', function( $args, $url ) {
	// only act on requests to api.mailchimp.com
	if( strpos( $url, 'api.mailchimp.com' ) === false ) {
		return $args;
	}

	$args['sslverify'] = false;
	return $args;
}, 10, 2 );

You can add this code to your theme its functions.php file or by putting it into a file of its own in the /wp-content/plugins/ folder with the proper plugin headers.

Hope that helps. If not, let me know!

PS. version 3.0.6 was meant to tackle this issue but apparently we’re still targeting the wrong CURL versions in the code, so if you could let me know which CURL versions you’re running then that would be SUPER helpful.

Hey all,

I’ve filed a bug report on WP Trac about this change but can’t guarantee it’ll get any priority as it only seems to be affecting a very small subset of sites out there. It seems to be that only certain versions of OpenSSL / PHP CURL are affected, although I am not yet entirely sure.

Until then, the following code will disable SSL verification for the requests to MailChimp and thus get rid of this error for now.

add_filter( 'http_request_args', function( $args, $url ) {
	// only act on requests to api.mailchimp.com
	if( strpos( $url, 'api.mailchimp.com' ) === false ) {
		return $args;
	}

	$args['sslverify'] = false;
	return $args;
}, 10, 2 );

Thank you Scamyre, appreciate the details! That OpenSSL bit is the important part, I think. 🙂