Common DNS Cache Issues and How to Resolve Them

DNS cache issues occur when DNS servers cache outdated or incorrect DNS information, which can lead to DNS resolution failures and other issues. Here are some steps that can be taken to resolve DNS cache issues:

Clear the DNS cache

Clearing the DNS cache on the affected DNS server can help resolve DNS cache issues. To clear the DNS cache, open a command prompt on the DNS server and type “ipconfig /flushdns” followed by Enter.

C:\>ipconfig /flushdns

Windows IP Configuration

Successfully flushed the DNS Resolver Cache.

C:\>

Also clear the DNS cache from DNS console.

Increase the Time-to-Live (TTL) value

Increasing the TTL value on DNS records can help reduce the amount of time that DNS information is cached, which can help prevent DNS cache issues. To increase the TTL value, open the DNS console, locate the DNS record you want to modify, right-click on the record, select Properties, and modify the TTL value.

Configure DNS scavenging

DNS scavenging is a feature that can be used to automatically remove stale DNS records from the DNS cache. Configuring DNS scavenging can help prevent DNS cache issues. To configure DNS scavenging, open the DNS console, right-click on the DNS server, select Properties, select the Aging tab, and configure the scavenging settings.

Restart the DNS server

Restarting the DNS server can help clear the DNS cache and resolve DNS cache issues. To restart the DNS server, open the Services console, locate the DNS server service, right-click on the service, and select Restart.

Disable caching on the DNS server

Microsoft DNS Servers typically keep a record in cache for one day. You might occasionally need to turn off this feature for a DNS Server. You can change the registry item listed below to stop this behavior:

• KEY Name: HKLM\System\CurrentControlSet\Services\DNS\Parameters
• Entry Name: MaxCacheTtl
• Type: REG_DWORD
• Value: 0x15180 (this is the default value)

By taking these steps, administrators can help prevent and resolve DNS cache issues, and ensure that DNS resolution is reliable and efficient.

So, that’s all in this blog. I will meet you soon with next stuff. Have a nice day!!!

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