NGINX域名解析失败求助：IP可访问但域名无法找到服务器IP

Hey there, let's break this down clearly—since you can reach your server via IP using SFTP/SSH without issues, the root problem is domain name system (DNS) resolution failure, not your server's services (like NGINX, which you confirmed is running correctly). Here's a step-by-step troubleshooting plan:

1. Verify DNS Record Configuration #

First, check if your domain has a valid DNS record pointing to your server's public IP:

• Run these commands on your local machine to query the domain's DNS records:

  nslookup dev.tinyturtles.co.nz
  dig dev.tinyturtles.co.nz
  

• Look for an A (IPv4) or AAAA (IPv6) record that matches your server's public IP. If no such record exists, log into your domain registrar's dashboard and add the correct record.

2. Check for DNS Cache Staleness #

DNS changes can take time to propagate (due to TTL, or Time-To-Live settings). To rule out cached old records:

• Query a public DNS server directly to bypass local cache:

  dig @8.8.8.8 dev.tinyturtles.co.nz
  

• If the public DNS shows the correct IP, flush your local DNS cache:
  • Windows: ipconfig /flushdns
  • Linux: systemd-resolve --flush-caches (or sudo systemctl restart systemd-resolved)
  • macOS: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

3. Confirm Your Server's Public IP #

Double-check that you're using the correct public IP for your server (not a private/internal IP):

• On your server, run this command to get your public IP:

  curl ifconfig.me
  

• Compare this IP to the one in your DNS records. If they don't match, update the DNS record to use the correct public IP.

4. Validate Domain Status #

Ensure your domain is in good standing:

• Check if the domain has expired (verify this via your registrar's dashboard).
• Confirm the domain has completed any required verification (like WHOIS or registrar-specific authentication)—unverified domains often have disabled DNS resolution.

5. Check Server-Side DNS (Optional) #

If even your server can't resolve the domain, check its DNS configuration:

• On Linux, look at /etc/resolv.conf to ensure it uses valid DNS servers (like 8.8.8.8 or 1.1.1.1).
• Test resolution from the server with:

  ping dev.tinyturtles.co.nz
  

  If this fails, update your server's DNS settings to use a reliable public DNS provider.

Remember: Since NGINX is running and accessible via IP, it's not the cause here—we just need to fix the DNS so that dev.tinyturtles.co.nz points to your server's IP correctly.

内容的提问来源于stack exchange，提问作者Jess McKenzie