The Domain Name System, or DNS, speaks over TCP port 53 and UDP port 53.
If you are hosting a DNS server, you will need to configure your firewall to allow traffic through these ports.
With HeatShield, you can quickly create a custom ruleset to open the DNS ports and apply that ruleset to your DNS servers.
First, connect your server to HeatShield and upgrade it to use custom rulesets.
Then, open your Rulesets page and click Create Ruleset.
Next, name your ruleset and click Create Ruleset.
Now, create a new firewall rule by selecting the policy, the destination, and the source.
Set the Policy to Allow and the Source to Any.
Select Custom from the Destination dropdown and enter TCP 53 as the DNS port. Click Add.
Repeat this step for UDP 53.
Your final ruleset will look similar to this example:
To apply your new ruleset to your DNS server, open the server in HeatShield.
Select your DNS ruleset from the drop-down list and click Apply Ruleset.
Your new ruleset will be applied.