To open the firewall GUI up completely, create a firewall rule to allow remote firewall administration – do not create a port forward or any other NAT configuration.

Example Firewall Rule Setup

• Firewall > Rules, WAN Tab
• Action: pass
• Interface: WAN
• Protocol: TCP
• Source: Any (or restrict by IP/subnet)
• Destination: WAN Address
• Destination port range: HTTPS (Or the custom port)
• Description: Allow remote management from anywhere (Dangerous!)