OPNsenseFirewallStatusError

OPNsenseFirewallStatusError #

OPNsense firewall is reporting errors

Alert Rule
alert: OPNsenseFirewallStatusError
annotations:
  description: |-
    OPNsense firewall is reporting errors
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/opnsense/opnsensefirewallstatuserror/
  summary: OPNsense firewall status error (instance {{ $labels.opnsense_instance }})
expr: opnsense_firewall_status == 0
for: 1m
labels:
  severity: critical

Meaning #

The OPNsenseFirewallStatusError alert is triggered when the OPNsense firewall status is reported as 0, indicating an error. This alert has a critical severity level and is designed to notify administrators of potential issues with the firewall configuration or operation. The alert includes labels and annotations that provide additional context, such as the instance name and error value.

Impact #

The impact of this alert can be significant, as a malfunctioning firewall can leave the network vulnerable to security threats. If the firewall is not functioning correctly, it may not be able to block malicious traffic, allowing potential attacks to reach the network. This can lead to data breaches, system compromises, and other security incidents. Furthermore, a faulty firewall can also disrupt network connectivity and performance, causing downtime and impacting business operations.

Diagnosis #

To diagnose the issue, administrators should follow these steps:

  1. Check the OPNsense firewall logs: Review the OPNsense firewall logs to identify any error messages or warnings that may indicate the cause of the issue.
  2. Verify firewall configuration: Check the firewall configuration to ensure that it is correct and up-to-date.
  3. Check for software updates: Verify that the OPNsense software is up-to-date, as updates may resolve known issues.
  4. Check system resources: Verify that the system has sufficient resources (e.g., CPU, memory, disk space) to operate the firewall.
  5. Check for network connectivity issues: Verify that the network connectivity is stable and not causing the issue.

Mitigation #

To mitigate the issue, administrators can follow these steps:

  1. Restart the OPNsense firewall service: Restarting the firewall service may resolve temporary issues.
  2. Apply configuration changes: If the issue is caused by a configuration error, apply the necessary changes to correct the configuration.
  3. Apply software updates: If the issue is caused by a known software bug, apply the latest software updates to resolve the issue.
  4. Increase system resources: If the issue is caused by insufficient system resources, consider increasing the resources (e.g., adding more CPU, memory, or disk space).
  5. Contact OPNsense support: If the issue cannot be resolved through the above steps, contact OPNsense support for further assistance.
Edit this page