Fix DNS Not Resolving

Understanding DNS Resolution

DNS converts domain names to IP addresses. When it fails, you cannot reach your server by domain.

Test DNS Resolution

# Check if DNS resolves
nslookup yourdomain.com
dig yourdomain.com
host yourdomain.com

# Check specific DNS server
dig @8.8.8.8 yourdomain.com

Fix 1: Check Local DNS Cache

Flush local DNS cache:

# Windows
ipconfig /flushdns

# macOS
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

# Linux (systemd-resolved)
sudo systemd-resolve --flush-caches

Fix 2: Check /etc/hosts

Local overrides can block resolution:

cat /etc/hosts
# Remove any entries for your domain if incorrect

Fix 3: Verify DNS Records

Check your domain DNS settings in Hostxpeed panel or registrar:

# Check A record
dig A yourdomain.com

# Check NS records
dig NS yourdomain.com

# Check CNAME
dig CNAME www.yourdomain.com

Fix 4: Check Nameservers

Ensure domain is pointing to correct nameservers:

whois yourdomain.com | grep -i "name server"

Fix 5: DNS Propagation

After DNS changes, propagation can take 24-48 hours:

# Check from different locations
https://dnschecker.org

Fix 6: Check DNSSEC

Invalid DNSSEC signatures break resolution:

dig +dnssec yourdomain.com

Disable DNSSEC temporarily to test.

Fix 7: Use Alternative DNS

Test using Google DNS (8.8.8.8) or Cloudflare (1.1.1.1):

dig @1.1.1.1 yourdomain.com