Debug website which returns (failed)net::ERR_CONNECTION_CLOSED on requests

Job ID: 32705541

Budget: $30 – $250 USD

We have a Wordpress site which makes a lot of requests to external resources. Image, css, js, etc.

The first time the page loads (or after clearing cache) the browser will load the first 100 or so resources, then all the rest of the resources won't load and return: (failed)net::ERR_CONNECTION_CLOSED

We need someone to figure out why this is happening and help us fix it.
Here is a link to see the issue: https://tinyl.io/5aOv
Clear browser cache, then open dev tools and open the URL. Check the 'Network' tab to see the resources that stay as 'pending' then eventually show the ERR_CONNECTION_CLOSED error after about 60 seconds.

- We've set up the same site on a development server and see the same issue there: https://tinyl.io/5aP0
- To rule out PHP or other issues we created an HTML page loading a single resource and it has the same problem: https://tinyl.io/5aP4
- We have other sites on this server with similar numbers of requests, but those sites load without an issue. For example: https://tinyl.io/5aP9

We can provide full access to the development server to research this. Currently we are not sure if the issue is with our server settings, website code, etc.

The final goal is to get https://tinyl.io/5aPC page to load all resources without any (failed)net::ERR_CONNECTION_CLOSED errors.
Related categories: PHP WordPress Apache Website Management Web Hosting