new install gives HTTP 404

Could you post your site URL here, so I can have a look?

If you want it to remain private, you can also contact us via this contact form:
http://jetpack.com/contact-support/

We seem to receive a 404 error whenever we try to communicate with both sites from a WordPress.com server. Do you use a security plugin that may restrict access to your site? If so, could you try to deactivate it for a few minutes, and let me know if it helps?

I’m afraid I still get the 404 error when trying to communicate with your site from a WordPress.com server.

I’m afraid I don’t have any more specific information: the 404 page I get is a generic one.

Could you check your site’s .htaccess file, to make sure that no rules restrict access to xmlrpc.php there?

P.S.: it’s worth noting that you don’t need to install the BruteProtect plugin anymore; its features were merged into the Jetpack plugin a couple of years ago.

Can you please use Jetpack’s Debugger module to send us some more information about your site?

1) Go to the Jetpack page in your dashboard.
2) Click on the Debug link appearing at the bottom of the page.
3) Click the link that says “click here to contact Jetpack support.”
4) Fill in the description box and your name and email address.
5) Click the “Contact Support” button to send us the debug results privately. It’s best not to post this information on public forums, as it contains private details about your site.

Thanks!