DNS Error Troubleshooting

DNS Error Troubleshooting

DNS Error Troubleshooting

A DNS error occurs when a domain name system (DNS) fails to resolve a domain name into an IP address, preventing access to websites or network resources. This can be caused by network issues, incorrect DNS settings, or server problems.

To check for DNS errors for a domain, follow these steps:
1. Use nslookup (Windows, macOS, Linux)

sh

nslookup example.com

  • If there’s an error like Non-existent domain or Server failed, there might be a DNS issue.

To check specific DNS records (like A, MX, or CNAME):

sh

nslookup -type=A example.com
nslookup -type=MX example.com
nslookup -type=CNAME example.com

2. Use dig (Linux/macOS)

sh

dig example.com

  • Look for the ANSWER SECTION. If empty, there might be an issue.
  • To check NS records:

sh

dig NS example.com

  • To check MX records:

sh

dig MX example.com

3. Use host (Linux/macOS)

sh

host example.com

4. Check with Online Tools

5. Check with a Different DNS Server

If your local DNS is caching an issue, test with a public DNS:

sh

nslookup example.com 8.8.8.8 # Google Public DNS
dig @1.1.1.1 example.com # Cloudflare DNS

6. Check DNS Propagation

If you’ve recently changed DNS records, they might not have propagated. Use:

7. Check for Misconfigurations

  • Verify nameservers with:

sh

whois example.com

  • Ensure your domain is active and not expired.

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