What is a 1000 Error?

A 1000 DNS points to prohibited IP error is a Cloudflare-specific error code for: "The website's DNS points back to Cloudflare's own proxy IP or a reserved address.".

How do I fix or troubleshoot a 1000 Error?

Common steps include reloading the page in your browser, checking for typos in the URL, verifying server status, clearing browser cache or cookies, and contacting the website owner or server administrator if the error persists.

1000 Error | Error-Message.Net

A Cloudflare Error 1000 indicates that an address record in your Cloudflare DNS settings points directly to one of Cloudflare’s own proxy IP addresses or a reserved IP address, causing an infinite routing loop.

Common causes

An A or CNAME record within your Cloudflare DNS app points to one of Cloudflare’s own proxy IP addresses or a reserved IP address instead of your true origin web server IP address.

When Cloudflare attempts to proxy traffic, it would end up forwarding requests in an infinite loop back into its own edge network.

Resolution

If you are not the website owner

Notify the website administrator that their domain has an Error 1000 configuration issue in Cloudflare.

If you are the website owner

Log into your Cloudflare dashboard and navigate to the DNS app.
Locate the A or AAAA record for the domain or subdomain receiving Error 1000.
Update the IP address to point to your origin web server’s true IP address (provided by your hosting provider), rather than a Cloudflare IP.

Source: Cloudflare Documentation - Troubleshooting Cloudflare 1XXX errors (Error 1000)