Troubleshoot Issues with Napatech in Tenable Nessus Network Monitor

Cannot engage Tenable Nessus Network Monitor in High Performance Mode from the UI

If you are unable to engage Tenable Nessus Network Monitor in High Performance Mode from the UI or command line:

1. Check the Tenable Nessus Network Monitor log file at /opt/nnm/var/nnm/logs/yyyymm.log where yyymm is the year and month (for example, /opt/nnm/var/nnm/logs/201909.log)
2. If you see a Cannot Create Ring for Worker Core X message, edit the /opt/napatech3/config/ntservice.ini file to match the Number of Worker Cores configured in the Tenable Nessus Network Monitor Settings Section.
3. Restart the ntservice and nnm services.

No Traffic seen in Tenable Nessus Network Monitor UI

1. Run the following command to display the traffic going through the Napatech card:
   /opt/napatech3/bin/monitoring
2. If you see traffic in the Napatech card but not in the Tenable Nessus Network Monitor user interface, perform the following steps:
   1. Run the following command:
      kill -10 `cat /var/run/nnm.pid`
   2. Run the following command, where yyyymm is the year and month (for example, /opt/nnm/var/nnm/logs/201909.log):
      less /opt/nnm/var/nnm/logs/yyyymm.log
   3. Go to the bottom of the file. If you see messages like the following, then you must restart the the ntservice and nnm services: