If your appliance monitors traffic filtered by a Web proxy, you can configure the appliance to identify blocking actions taken by the Web proxy. This enables the appliance to distinguish traffic blocked by the Web proxy from traffic blocked by the appliance.
Enabling and configuring blocked-by-proxy detection using the Web UI
Enabling or disabling blocked-by-proxy detection using the CLI
Configuring custom subject lines for emailed notifications using the CLI
Configuring a custom wait time for blocked-by-proxy detection using the CLI
Viewing blocked-by-proxy detection configuration using the CLI