You can force all accesses to the PXE via HTTP to be redirected to HTTPS. See Changing HTTP(S) Settings.
See Also
Using the Web Interface
Supported Web Browsers
Logging in to the Web Interface
Logout
Introduction to the Web Interface
Viewing the Dashboard
Device Management
User Management
Setting Up Roles
Access Security Control
Setting Up an SSL Certificate
Setting Up External Authentication
Outlet Management
Inlet and Overcurrent Protector Management
Setting Power Thresholds
Event Rules and Actions
Managing Event Logging
Viewing Connected Users
Monitoring Server Accessibility
Environmental Sensors and Actuators
Bulk Configuration
Backup and Restore of PXE Device Settings
Network Diagnostics
Downloading Diagnostic Information
Firmware Upgrade
Accessing the Help