Hi @adamludolph –
In order to generate critical CSS, we need to have a working connection between your site and Jetpack. Right now, we’re seeing the error: http_request_failed cURL error 28: Operation timed out after 15001 milliseconds with 0 bytes received
This error typically means that your server isn’t responding quick enough to our requests and is timing out. It may indicate excessive load on your server.
I would recommend checking with your hosting provider on your server load. They may be able to identify issues that are causing it to respond slowly. Additionally, please also check for anything that is blocking requests toxmlrpc.php.
Jetpack uses this file to communicate with your site, but some hosts block connection requests to that file.
Our requests look like the following:
- File: xmlrpc.php
- User-agent header: Jetpack by WordPress.com
- IPs: https://jetpack.com/support/how-to-add-jetpack-ips-allowlist/
Please ask them to allowlist the IP addresses listed above. Note that these IP addresses could change (or more could be added) at any time, which could break your connection to Jetpack. For this reason, we actually discourage allowing specific IPs, although with some hosts it may be the only option.
Once you have a working connection with Jetpack, you should be able to generate Critical CSS without issue.
Let us know how that goes.
