Title: Plugin MC4WP doesn’t connect with Mailchimp Last modified: October 18, 2023 --- # Plugin MC4WP doesn’t connect with Mailchimp * Resolved [snowstone](https://wordpress.org/support/users/snowstone/) * (@snowstone) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/) * Hello Support! * I received an order for upgrading a website that was long without maintenance. The website has been upgraded from WP 4.7.23 to WP 6.3.2 with all the plugins, and theme updated. * Now we have an issue (that also was present before the upgrade) with the Subscription form to MailChimp done with your plugin. * The issue is that when a user tries to Submit the subscription from it throws the following error (shown in 2 images): * [https://photos.app.goo.gl/o3usAhfrutH6Ekgi8](https://photos.app.goo.gl/o3usAhfrutH6Ekgi8) * [https://photos.app.goo.gl/sqLLdmv5hRuLyXsd7](https://photos.app.goo.gl/sqLLdmv5hRuLyXsd7) * The error shown internally is also shown in the folowing image. And also the Form shows “NOT CONNECTED” when I try to Save Changes. * The API-Key is recently created. * [https://photos.app.goo.gl/DojEcwT14A7D6sm78](https://photos.app.goo.gl/DojEcwT14A7D6sm78) * I’ve read in your documentation, that this error could be due to a server misconfiguration: * > Mailchimp API key or MC4WP license not activating > When trying to activate a > Mailchimp API or license key that you just know should be working, it can sometimes > refuse to activate. In that case, one of two things could be happening: > The PHP cURL version of the server your website is hosted on is out of date. > Solution: ask your host to update cURL to a more recent version. > Your host’s > firewall is blocking SSL requests. Solution: ask them to allow SSL requests > to api.mailchimp.com and mc4wp.com. > [https://www.mc4wp.com/kb/what-to-do-if-you-run-into-trouble/](https://www.mc4wp.com/kb/what-to-do-if-you-run-into-trouble/) * I contacted support from my server ([https://raiolanetworks.es/](https://raiolanetworks.es/)) but they told me that from their side everything is running smoothly and that I should contact you or MailChimp. * Do you know how to solve the issue? * Do you need Access data? (How do I give you that without making it públic?) * Thanks, * Pere * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fplugin-mc4wp-doesnt-connect-with-mailchimp%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 7 replies - 1 through 7 (of 7 total) * Plugin Contributor [Lap](https://wordpress.org/support/users/lapzor/) * (@lapzor) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17132458) * On MC4WP > Mailchimp, when you click the “connect” button, it shows an error. Can you translate that error for me, what does it mean in English? Thanks for letting me know. * Thread Starter [snowstone](https://wordpress.org/support/users/snowstone/) * (@snowstone) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17134287) * There is no “Connect” button, but one that says “Save Changes” (Guardar Cambios) right below the API Key field. Whenever you click that button it says in a red box this message: **MailChimp Error: Validation error: “Campos de formulario no v\u00e1lidos”** * Which means: “Form fields not valid” * Is that what you meant? * Thanks * Plugin Contributor [Harish Chouhan](https://wordpress.org/support/users/hchouhan/) * (@hchouhan) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17134967) * Hello, * Can you please share with us the WordPress version & plugin version of MC4WP you have installed? Also, can you reach out to us using the details at [https://www.mc4wp.com/contact/](https://www.mc4wp.com/contact/)? * Thread Starter [snowstone](https://wordpress.org/support/users/snowstone/) * (@snowstone) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17137800) * Here you have the details: * WordPress version: 6.3.2 * MC4WP version: 2.3.17 * I’ve contacted you also through this e-mail: [support@mc4wp.com](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/support@mc4wp.com?output_format=md) * Thanks a lot, * Pere * Plugin Contributor [Harish Chouhan](https://wordpress.org/support/users/hchouhan/) * (@hchouhan) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17142446) * Hey Pere, * We haven’t received any direct messages from you yet. Please reach out to us again. * Thread Starter [snowstone](https://wordpress.org/support/users/snowstone/) * (@snowstone) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17143553) * Here is an image of the message sent. * [https://photos.app.goo.gl/AAJpswnTKvk6n2ho6](https://photos.app.goo.gl/AAJpswnTKvk6n2ho6) * I forwarded the email again. * please reply when you receive it * Plugin Contributor [Lap](https://wordpress.org/support/users/lapzor/) * (@lapzor) * [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17143570) * It seems you are on a very old version of the MC4WP plugin. The latest version is 4.9.9. Please update the plugin and let us know if that solves the issue. Viewing 7 replies - 1 through 7 (of 7 total) The topic ‘Plugin MC4WP doesn’t connect with Mailchimp’ is closed to new replies. * ![](https://ps.w.org/mailchimp-for-wp/assets/icon-256x256.png?rev=1224577) * [MC4WP: Mailchimp for WordPress](https://wordpress.org/plugins/mailchimp-for-wp/) * [Frequently Asked Questions](https://wordpress.org/plugins/mailchimp-for-wp/#faq) * [Support Threads](https://wordpress.org/support/plugin/mailchimp-for-wp/) * [Active Topics](https://wordpress.org/support/plugin/mailchimp-for-wp/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/mailchimp-for-wp/unresolved/) * [Reviews](https://wordpress.org/support/plugin/mailchimp-for-wp/reviews/) * 7 replies * 3 participants * Last reply from: [Lap](https://wordpress.org/support/users/lapzor/) * Last activity: [2 years, 7 months ago](https://wordpress.org/support/topic/plugin-mc4wp-doesnt-connect-with-mailchimp/#post-17143570) * Status: resolved