A cisco Secure firewall Threat Defence device is configured in inline IPS mode to inspect...

In inline IPS mode, to ensure that traffic passes through uninterrupted when VDB (Vulnerability Database) updates are being applied, the "Short Fall Open" setting must be configured. This setting allows traffic to continue to flow through the firewall even if there are issues with the inspection process, such as during updates or if the inspection engine fails.

Steps:

In FMC, navigate to the inline set configuration.

Enable the "Short Fall Open" option.

Deploy the configuration to the FTD device.

This ensures that network traffic is not disrupted during updates or other issues with the inspection process.