How Do I Authorize My DNS Server?


Larry Thompson

Authorizing your DNS server is an essential step in ensuring the smooth functioning of your website. By authorizing your DNS server, you grant it the necessary permissions to respond to DNS queries and provide the correct IP address for your domain. In this tutorial, we will discuss how to authorize your DNS server effectively.

Understanding DNS Authorization

DNS authorization involves configuring your DNS server with the necessary information to validate its identity and establish trust with other DNS servers. When a user requests a domain name, their device sends a query to a DNS server, which then looks up the corresponding IP address. By authorizing your DNS server, you ensure that it is recognized as a trusted source of this information.

Types of DNS Authorization

There are two primary methods for authorizing your DNS server: using a digital certificate or configuring a TSIG key.

1. Digital Certificate

A digital certificate is an electronic document that binds cryptographic keys to an entity’s identity.

It provides assurance that the public key belongs to the entity claimed and helps establish trust between parties. To authorize your DNS server using a digital certificate:

  • Create a Certificate Signing Request (CSR): Generate a CSR with your preferred software or through your hosting provider.
  • Submit the CSR: Send the CSR file to a trusted Certificate Authority (CA) for validation and signing.
  • Install the Certificate: Once approved, install the issued certificate on your DNS server.
  • Configure Server Software: Update your server software’s configuration files to reference the installed certificate.

2. TSIG Key Configuration

A Transaction Signature (TSIG) key is a shared secret key used to authenticate DNS communication between servers. To authorize your DNS server using a TSIG key:

  • Generate a TSIG Key: Create a unique TSIG key with your DNS software or through command-line tools.
  • Configure the Receiving Server: On the receiving server, add the TSIG key to its configuration file.
  • Configure the Sending Server: On the sending server, update its configuration file to include the TSIG key for authentication.
  • Test and Verify: Perform tests to ensure successful communication between the two servers using the TSIG key.

Troubleshooting DNS Authorization Issues

If you encounter any issues during the authorization process, consider the following troubleshooting steps:

  1. Check Configuration Files: Double-check your configuration files for any typos or syntax errors that could be causing problems.
  2. Verify Certificate Installation: Ensure that your digital certificate is correctly installed on your DNS server and referenced in its configuration files.
  3. Confirm Trust Chain: If using a digital certificate, verify that all intermediate certificates in the trust chain are properly installed.
  4. Review Firewall Settings: Check if any firewall rules are blocking communication between your authorized DNS server and other servers.


Authorizing your DNS server is crucial for ensuring secure and reliable domain name resolution. By following the steps outlined in this tutorial, you can successfully authorize your DNS server using either a digital certificate or a TSIG key. Remember to regularly monitor and update your authorization settings to maintain a secure DNS environment for your website.

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