To troubleshoot issues in DDI:

1. Check the license status through the Administration > Product License section of the web console. If the license is invalid, DDI will not log detection events, perform updates and many functions will be grayed out on the web console.
2. Verify if DDI can connect back to the related backend services via Network Services Diagnostics. For the steps, refer to Verifying Backend Services in Deep Discovery Inspector (DDI) 5.1.

3. Go to Administration > System Settings > Network Interface to check if the network interfaces are active.

   If an interface is not active, check the physical connection of the network switch. Ensure that the data ports are connected to the correct SPAN or network tap port.

   

4. Verify if DDI is receiving network packets. To capture the packets on each port, do the following:

   1. Go to the Network Traffic Dump screen.

      

   2. Select the data ports and input tcpdump expression (optional) then click Capture Packets. Wait for a session to finish before starting a new one.

      

   3. Click Stop to end the packet capture.
   4. Click View to see information about the captured packets using the web console.

5. Verify if there are any system logs for error or warning conditions via the Administration > System Logs section of the web console.

   

6. If further assistance is required, collect the error logs and configuration settings first before contacting Technical Support. To collect the error logs and configure the settings, do the following:

   1. Access the troubleshooting page: https://DDI_IP/html/troubleshooting.htm.

   2. Go to Logs > Debug Logs.

      

   3. Under Debug Log and Configuration Export > Select information to export, choose Export appliance configuration and Export debug log.

       

      To conserve system resources, perform only one export at a time.

      

   4. Click Export.