When you make a change in the UniFi web UI or mobile app—such as adding a VLAN, configuring a firewall rule, or setting up a site-to-site VPN—the UniFi Network Application does not execute those commands directly on the operating system. Instead, it sends an API request to the ubios-udapi-server . The daemon processes this structured data and translates it into actual system-level actions. Core Technical Responsibilities
Before you attempt any manual configuration, it is critical to understand the risks.
The ubios-udapi-server is a proprietary daemon developed by Ubiquiti that manages the underlying routing, switching, and firewall configurations on UniFi OS devices. It acts as the central middleware translator between the user-facing UniFi Network Application (the GUI controller) and the native Linux kernel networking subsystems. The Evolution: From EdgeOS to UniFi OS ubios-udapi-server
The ubios-udapi-server is a critical backend service operating within the UniFi OS environment. It serves as the primary translation layer between the UniFi Network Application (Controller) and the underlying hardware drivers of Ubiquiti networking devices (Switches, Access Points, and Gateways). By implementing a standardized JSON-RPC and WebSocket API, the UDAPI server abstracts hardware complexities, enabling centralized management, real-time telemetry, and high-speed configuration deployment across the UniFi ecosystem.
: Controls the lifecycle of various internal services, including the dnsForwarder , dpi (Deep Packet Inspection), radius-profiles , and geoipFiltering . When you make a change in the UniFi
The UniFi Network Application provisions this change, pushing a structured JSON payload to the UniFi OS system.
| Function | HTTP Method | URI Path | | :--- | :--- | :--- | | List sites | GET | /proxy/network/api/v2.1/sites | | List devices | GET | /proxy/network/api/v2.1/sites/site/devices | | List clients | GET | /proxy/network/api/v2.1/sites/site/clients | | Block a client | POST | /proxy/network/api/v2.1/sites/site/clients/mac/block | | Create network | POST | /proxy/network/api/v2.1/sites/site/networks | | Update firewall rule | PATCH | /proxy/network/api/v2.1/sites/site/firewall/rules/id | The Evolution: From EdgeOS to UniFi OS The
systemctl status ubios-udapi-server
The response was not “active (running)” as expected. It was: