Check domain DNS
Once you add and activate your domain at Cloudflare, check that all your DNS records are set up correctly.
If your website already existed before adding it to Cloudflare, the easiest way to test DNS resolution is to try and visit your domain (example.com) or a subdomain (www.example.com).
As long as you reviewed your DNS records when adding your domain, everything should work just fine.
Sometimes, domains added to Cloudflare can experience issues in DNS resolution.
flowchart TD accTitle: Potential DNS resolution issues A[Request to <code>example.com</code>] --> B[<code>DNS_PROBE_FINISHED_NXDOMAIN</code>] B --> C[DNS records missing or incorrect] A --> D[Error <code>520</code>, <code>521</code>, or <code>522</code>] D --> E[Origin server offline or blocking Cloudflare IPs] A --> F[Error <code>523</code>, <code>1000</code>, <code>1001</code>, <code>1002</code>, <code>1014</code>, <code>1016</code>, or <code>1034</code>] F --> C
For more details on these errors and how to fix them, refer to the following resources:
DNS_PROBE_FINISHED_NXDOMAIN- Cloudflare 5xx errors
- Cloudflare 1xxx errors
- Add a record on the zone apex
- Add a subdomain
- Allow Cloudflare IP addresses
If your domain supported email beforehand, try sending a few emails to your domain's address.
If those emails cannot be delivered, the issue is usually with your domain's MX DNS records. For help, refer to the following resources: