Common DNS Issues and How to Solve Them

1- DNS Troubleshooting Checklist

Check Your Name Servers

The first step is verifying that your domain is using the correct name servers, Use online tools such as:

1- intoDNS

2- ICANN Lookup

3- WHOIS databases

If the name servers are incorrect or outdated, update them through your domain registrar.

Check If Your Domain Is Valid and Active

Ensure your domain:

• Is registered
• Is not expired
• Is renewed on time

Expired domains will not resolve until renewed.

Check Whether DNS Records Are Correct

DNS records may break if:

• Name servers were changed recently
• DNS zones contain missing or incorrect entries
• Records weren’t added properly during migration

Use DNS lookup tools to verify the zone:

• A, CNAME, MX, TXT records
• NS records
• SOA record

Check If A Records Point to the Right IP

Make sure your domain points to the correct hosting IP address.
Incorrect A records are one of the most common reasons websites fail to load—especially when using external DNS.

2- Understanding DNS Propagation

Why Does Propagation Take Time?

When DNS changes are made, devices and ISPs across the world update their cached records at different speeds.
Typical propagation times:

• Nameservers: 24–48 hours
• A/MX/CNAME/TXT: 4–8 hours (can take up to 24–48 hours globally)

Some users may see the updated site immediately, others may not—this is normal.

Can I View My Site Before Propagation Completes?

Yes — using one of these methods:

• Modify your hosts file to force your device to load from a specific IP
• Flush your device DNS cache
• Access your server directly via temporary URL or preview URL (if supported)

3- Propagation Workarounds

Flush DNS (Local Cache Reset)

If your device is showing the old version of your site:

• Flush DNS on your computer
• Restart router
• Try a different network (mobile data vs Wi-Fi)

If your ISP is caching the old DNS, flushing may not help — you’ll need to wait for propagation.

Modify Your Hosts File

This method forces your computer to bypass DNS temporarily.
Useful when:

• DNS hasn’t propagated yet
• You’re migrating a site
• You want to preview before switching DNS

Editing the hosts file lets you load the site directly from the server IP, even if global DNS is outdated.

4- Additional Information

What Happens to DNS When Hosting Expires?

If your hosting service is canceled or expires:

• All DNS records stored on that DNS server are permanently deleted
• There is no backup unless you manually exported a DNS zone file
• Some historical DNS traces may appear on tools like DNS Trails, but not guaranteed

Always back up your DNS zone before switching hosts.