Hi Bill,
Did you try to uninstall/reinstall the Jetpack plugin and then connect the site to Jetpack?
If the above is not working, then it might be possible there is something at your host blocking Jetpack to connect. While your site is publicly accessible, and XML-RPC file is also working: https://example.com/xmlrpc.php (replace example.com with your actual domain), but for some reason, it appears, Jetpack is not able to make XML-RPC requests on your site. This file is used by Jetpack and other plugins and apps to connect to your site.
Can you please contact your hosting provider and check if they are blocking access to this file for Jetpack? Also, please find the IP ranges for the connection between your site and Jetpack/WordPress.com here, and whitelist them for HTTP connections on your site.
If you’re unsure about this, you may contact your hosting provider; they should be able to help you with this. Please note that these IP addresses could change (or more could be added) at any time. For that reason, we recommend your host uses the machine-readable versions of these IP ranges in JSON or plain text format to automate configuration changes on their systems.
Once we are able to access your site’s?xmlrpc.php file, you should be able to connect Jetpack to?https://wordpress.com.
Let me know how it goes!