Aria Operations for Networks Collector Disconnected and Prompts for Deletion.
Article ID: 445123
Updated On:
Products
Issue/Introduction
Aria Operations for Networks (AON). One of the Collector VMs is not working and appears disconnected from the Platform. When attempting to edit the configuration, the UI prompts to delete the collector option. Initial checks indicate all internal services are running on the Collector VM, but communication with the Platform node fails.
Environment
Aria Operations for Networks 6.14.x
Cause
The primary cause of this behavior is a time synchronization (NTP) drift between the Platform VM and the Collector VM, which silently breaks the certificate-based secure communication tunnels preventing data transfer.
Resolution
1. Verify and Restart the Collector Services
Since the platform specifically asked to check if the services are running, let's start there.
SSH into the Collector VM using the consoleuser credentials.
Run the status command:
show-service-status
Analyze the output: Look for any service marked as Stopped or Failed.
2. Check for Time Synchronization (NTP) Drift
This is the most common hidden cause of disconnected Collectors. The Platform and the Collector use certificates and secure tunnels to communicate. If the time difference between the Platform VM and the Collector VM drifts by more than a few minutes, communication will silently fail.
SSH into both the Platform VM and the Collector VM.
Run the following command on both:
show-ntp
(You can also run show-date to see the current system time).
Action: Compare the outputs. The time must match almost exactly. If the Collector's time is off, verify that your NTP servers are reachable and configured correctly. You may need to reconfigure the NTP settings if they are failing to sync.
3. Validate Network Connectivity and Firewalls
If the services are running and the time is synced, a firewall or routing change might be blocking traffic between the Collector and the Platform.
From the Collector CLI, try pinging the Platform node to verify basic routing:
ping <Platform_IP_Address>
Verify Required Ports: The Collector needs to be able to reach the Platform node over specific ports to send data. Ensure your network firewalls allow traffic from the Collector IP to the Platform IP on at least:
Port 443 (TCP): For UI/API communication.
Port 1194 (UDP): AON uses an internal OpenVPN tunnel for data transfer between the Collector and the Platform. If UDP 1194 is blocked, the collector stays "connected" in the UI, but no data actually flows.
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