This guide will help you diagnose and resolve common issues with Cloudflare's DNS Resolver. Before proceeding with manual troubleshooting steps, you can use our diagnostic tool ↗ to automatically gather relevant information.
Name resolution issues
Linux/macOS
Windows
Note: The network information command reveals your IP address. Only include this in reports to Cloudflare if you are comfortable sharing this information.
For additional analysis, you can generate a DNSViz ↗ report for the domain in question.
Connectivity and routing issues
Before reporting connectivity issues:
Search for existing reports from your country and ISP.
Run traceroutes to both Cloudflare DNS resolvers.
Linux/macOS
Windows
DNS-over-TLS (DoT) troubleshooting
Linux/macOS
Windows
Windows does not include a standalone DoT client. You can test TLS connectivity using OpenSSL after installing it manually.
DNS-over-HTTPS (DoH) troubleshooting
Linux/macOS
Windows
Common issues
First hop failures
If your traceroute fails at the first hop, the issue is likely hardware-related. Your router may have a hardcoded route for 1.1.1.1. When reporting this issue, include: