Documentation forHybrid Cloud Observability Essentialsand Server & Application Monitor

DNS Monitor - TCP

This SAM component monitor tests a DNS server's ability to respond to a record query and measures its response time. The record query is an A Name lookup for The component monitor passes if it receives a valid DNS response (positive or negative).


This component monitor does not compute a statistic.

Field descriptions


A default description of the monitor. To override the default description, add to or replace existing text. Changes are automatically saved. The variable to access this field is ${UserDescription}.

Customize descriptions to specify what will be monitored so related alerts and notifications are more meaningful later.

Enable Component

Determines if the component is enabled. Disabling the component leaves it in a deactivated state that does not influence its application availability or status, as displayed in the Orion Web Console.

Port Number

The TCP port used for DNS queries. The default value is 53.

Response Time Threshold

Set the warning and critical threshold conditions based on the response time. The response time is the time in milliseconds it takes SAM to determine that a component is not Down and to retrieve any statistical data. See Application Monitor Thresholds.

User Notes

Add notes for easy reference. You can access this field by using the variable, ${UserNotes}.