Hello,
We apologize for the issue you are facing with the API Error: cURL error 28. This error typically indicates that your website is taking too long to respond, which can be due to several reasons. Here are some steps you can take to troubleshoot this issue:
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Check Website Status: Ensure that your website is returning a 200 status code. You can check the status of your website here. Enter your URL and click Check Status.

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API Timeout: If your website takes more than 30 seconds to load, it may result in a timeout error. Try optimizing your website’s performance to reduce loading time.
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Firewall Settings: Sometimes, server security or firewall settings can block API requests. Ensure that the IP 46.30.211.100 (or 193.138.6.5 depending on your setup) is whitelisted in your firewall settings.
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Locally Hosted Website: If your site is hosted locally, the SEO Analyzer module will not work and will return an API error. Ensure your site is live and accessible from external sources.
If you continue to experience issues after trying these steps, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
Thank you for raising this concern, and we appreciate your patience as we work to resolve it!
Sources:
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
Hello,
Thank you for contacting us. We apologize for any inconvenience this issue may have caused.
The error is related to the server connection, and not from Rank Math. The issue is with the cURL library (used by the SEO Analyzer) not being able to complete the request due to server-side constraints, often caused by server load or configurations.
You may want to contact your hosting provider to check the server load or network stability.
Hope that helps, and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.