Troubleshooting Guide
This guide provides technical procedures for diagnosing and resolving issues with NetFlow Optimizer (NFO) and the External Data Feeder for NFO (EDFN).
To resolve an issue quickly, identify your symptom in the categories below:
Self-Service Triage
Connectivity & Firewalls
Symptoms: Cannot log in to the Web UI, NFO processes aren't starting, or exporters cannot reach the NFO port.
- Verify Tomcat (8443) and NFO (20047/20048) ports.
- Configure
ufworfirewalldrules. - Check for rejected packets at the OS level.
Logs & Diagnostics
Symptoms: Unexpected system behavior or preparing to contact NetFlow Logic Support.
- Review NFO Status page.
- Access NFO and EDFN internal logs.
- Learn how to "Download Logs".
- Configure log rotation and retention settings.
Data Quality & Performance
Symptoms: Counters on the Status page show "Drops," data is missing in your SIEM, or traffic volume seems inaccurate.
- Diagnose input/output queue overflows.
- Verify timestamp accuracy and sequence correction.
- Troubleshoot "authoritative" deduplication logic.
SNMP & Discovery
Symptoms: SNMP Information Monitor shows no data, or the Auto-discovery Reporter is empty.
- Test SNMP reachability via CLI.
- Verify OID configurations and MIB loading.
- Troubleshoot EDFN connectivity for discovery results.
Quick Verification
If you have just installed NFO, run these commands to ensure the core engine is healthy:
| Component | Port | Verification Command |
|---|---|---|
| Web UI | 8443 | `netstat -npl |
| NFO Engine | 9995* | tcpdump -i any udp port 9995 |
| Control Link | 20047 | `netstat -an |
*Default port; check your Input configuration if customized.
Still Need Help?
If you cannot resolve your issue using this guide:
- Generate a diagnostic bundle via Tracing and Configuration > Download Logs.
- Open a support ticket at the NetFlow Logic Support Portal.
- Attach the diagnostic bundle to your ticket for faster resolution.