:Why is my domain name not resolving?

Common causes of domain name resolution failure:

• Newly registered domain

• The domain has expired

• The subdomain is hosted elsewhere

• A DNS record was recently modified

• The domain's DNS servers were recently changed

• The domain is not using Alibaba Cloud DNS servers

• A default DNS line is not configured

A newly registered domain requires DNS propagation to servers worldwide, which may take time. If resolution issues persist, manually update the domain's DNS servers. Changes can take up to 48 hours to propagate globally.

When a domain expires, its DNS records are suspended and the website becomes inaccessible.

Resolution: Check the domain's expiration date with the Alibaba Cloud WHOIS tool. If expired, Renew a domain name promptly. Resolution typically resumes within 24 to 48 hours after renewal.

If a subdomain is hosted with a different provider or account, DNS settings for the parent domain do not apply to it. For example, if example.com is managed by Alibaba Cloud DNS but www.example.com is hosted elsewhere, changes to DNS records for www.example.com under example.com will not take effect.

Resolution: Configure DNS records for www.example.com on its hosting service, then test resolution.

After modifying a DNS record, the change takes effect only after cached records on local DNS servers expire. The duration depends on the previous record's TTL. FAQ about DNS record propagation time.

Changing a domain's DNS servers can take up to 48 hours to propagate globally. During this period, keep DNS data identical on both the old and new providers. Resolution fails if you delete data from the old provider before propagation completes or if the new provider lacks the correct data. FAQ about changing domain DNS servers.

Verify that your domain uses the DNS servers assigned by Alibaba Cloud DNS. Check your current DNS servers with the Alibaba Cloud WHOIS tool. If the servers in the WHOIS results do not match the table below, your domain is not using Alibaba Cloud DNS. Contact your current DNS provider to troubleshoot.

Resolution: Change your domain's DNS servers to match those assigned by Alibaba Cloud DNS. How to change DNS servers for a domain registered with Alibaba Cloud.

Without a DNS record with the source set to 'Default' as a fallback, resolution may fail for requests that do not match any configured DNS line.

Resolution: Add a DNS record with the source set to 'Default'. Test resolution after the cached record expires (based on its TTL).