Cloudflare Error 1003 occurs when a client or browser tries to access a website directly using its IP address instead of the domain name. Let’s look into the troubleshooting details. As part of our Server Management Service, Bobcares provides answers to all of your questions.

Overview

1. More on Cloudflare Error 1003
2. Fixing the Error

More on Cloudflare Error 1003

When a client or browser tries to contact a website directly using its IP address rather than the domain name, Cloudflare Error 1003 usually happens. This is a security feature that Cloudflare has put in place to stop unwanted users from visiting the website. Here are the primary reasons and fixes for Cloudflare Error 1003:

Fixing the Error

Cause 1: Incorrect or outdated DNS settings disrupt the domain-to-IP mapping, leading to the Error 1003.

Fix: Verify domain mapping to Cloudflare’s nameservers, ensure correct configuration of DNS records (A, AAAA, CNAME), and update any erroneous records through the domain registrar or DNS host.

Cause 2: Security rules in the network firewall or software blocking connections from Cloudflare’s IP ranges cause Cloudflare Error 1003.

Fix: Ensure firewall and security software rules permit traffic from Cloudflare’s IP addresses. Review and update rules as needed to allow connections to the origin web server.

Cause 3: Stale cached data in the browser can cause the Error 1003 by directing access to the website via an IP address instead of the domain name.

Fix: Clear browser cache and cookies, then try accessing the website using the domain name again.

Cause 4: Improper setup, like mismatched SSL/TLS encryption modes, can trigger the Error 1003.

Fix: Correct Cloudflare’s SSL/TLS mode settings, ensure server-side settings match, and if using “Full” or “Full (strict)” mode, ensure the origin server has a valid SSL certificate installed and handles HTTPS connections correctly.

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Conclusion

To sum up, our Support team went over the details to fix the Cloudflare Error 1003 which occurs when a client or browser tries to access a website directly using its IP address.