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Error: MQTT Connection Offline

After enabling Activity Monitoring, if you encounter an "MQTT Connection offline" error, follow the steps below:

  1. Ensure the agents have outbound connectivity to Trend Vision One.

    If you have a firewall or proxy, add the following uniform resource locator (URL) address to the allow list and the secure sockets layer (SSL) / transport layer security (TLS) inspection settings:

    agent-comm.workload.<cloudoneregion>.cloudone.trendmicro.com

    • For accounts created before August 4, 2021, use us-1 for the region.
    • For accounts created on or after August 4, 2021, verify the region by logging in to Cloud One, and navigating to Account Settings.

    See Required Workload Security URLs for the latest address list.

  2. Verify the agent Activity Monitoring configuration on the machine.

    • For Windows, enter the following commands when running a command prompt as Administrator:

      cd "C:\Program Files\Trend Micro\Deep Security Agent"
sendCommand.cmd --get GetConfiguration | findstr -i Sensor

    • For Linux, enter the following command in a terminal:

      sudo /opt/ds_agent/sendCommand --get GetConfiguration | grep -i "sensor"

    The result should be as follows:

    sensorActivityEnabled=true
Feature SENSOR state= 1

  3. Ensure the Internet of Things (IoT) connection is online.

    • For Windows, enter the following commands when running a command prompt as Administrator:

      cd "C:\Program Files\Trend Micro\Deep Security Agent"
sendCommand --get GetIoT

    • For Linux, enter the following command in a terminal:

      sudo /opt/ds_agent/sendCommand --get GetIoT

  4. Ensure you have the latest agent. See Upgrade the agent from the Computers page.

  5. If the issue persists, submit a ticket to Trend Micro Cloud One Support.