Troubleshooting

This section details procedures you can do when the appliance behaves abnormally.

Cannot Connect to the Appliance

Symptoms

If you have configured an HMI to connect with your appliance, you receive a notice that it cannot be reached or that it is offline, after it was operating normally. If it is not connected to an HMI, you may not realize that the appliance is offline.

Problem description

You may have a tbridge process failure. This process controls all of the communication and policy implementation, and it crashes when it runs out of memory.

When the process first fails, the appliance attempts to restart it. If it cannot be restarted after 60 seconds, then the appliance will go into a fail-open mode. The mode allows network traffic to bypass the appliance, but the appliance itself will be offline.

Problem verification

The HMI will not be able to connect to the appliance.

Try to log into the web interface directly or use the Console on the Windows Host Machine. If neither can connect, the appliance is offline.

Correction

The first time the appliance is offline, wait 60 seconds to allow it to restart. If it is still offline, reboot the appliance by powering it off and then on. The logs will be cleared.

If the appliance goes offline again, contact Support.