DNS裸域无法解析求助：服务器管理新手的域名解析问题

Hey there! As someone who’s stumbled through plenty of DNS headaches when starting out, let’s walk through the most common fixes for your bare domain (planandshop.co.uk) not resolving while your www subdomain works just fine.

Key Checks to Run Right Now #

• Verify your new record type & value: Bare domains typically use an A (IPv4) or AAAA (IPv6) record pointing directly to your server’s IP. If you used a CNAME, note that some DNS providers block CNAME records for bare domains (they conflict with essential records like MX). Double-check the IP matches what you’re using for your www subdomain if that’s your intended setup.
• Check TTL (Time To Live) settings: If your old bare domain record had a high TTL (e.g., 86400 seconds = 24 hours), DNS servers across the internet might still be caching the old (or non-existent) record. Run these terminal commands to see what’s currently being returned:
  • nslookup planandshop.co.uk
  • dig planandshop.co.uk
    Look for the "ANSWER SECTION"—if it’s empty or shows an outdated IP, the new record hasn’t propagated yet.
• Confirm your changes were saved: It sounds obvious, but it’s easy to forget to hit that Save or Publish button in your DNS provider’s dashboard. Double-check that your new record is listed in the active zone file.
• Flush local DNS cache: Your device might still be holding onto old DNS data. Clear it with these commands:
  • Windows: ipconfig /flushdns
  • macOS: sudo killall -HUP mDNSResponder
  • Linux (systemd-based): sudo systemd-resolve --flush-caches
• Check for conflicting records: Make sure there aren’t other records for your bare domain (like MX, TXT, or old A records) that might be causing conflicts. Some providers won’t allow overlapping records for the same domain.

If after waiting a few hours (propagation can take up to 48 hours in rare cases) and running these checks the issue still exists, sharing the exact details of the record you added (type, value, TTL) would help narrow things down further.

内容的提问来源于stack exchange，提问作者Robert Owen