It acts as the software bridge between high-level management tools, like the UniFi Network application, and the low-level Linux operating system running on devices like the Ubiquiti UniFi Dream Machine Pro and UISP consoles. If you manage Ubiquiti infrastructure, understanding this background process is essential for troubleshooting high CPU spikes, diagnosing WAN connection drops, and optimizing security performance. What is ubios-udapi-server ?
UDAPI implements a JSON-RPC 2.0 compliant interface for structured command execution. This ensures that commands sent from the controller (e.g., "Change Port 5 to VLAN 20") are executed transactionally. ubios-udapi-server
| 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 | It acts as the software bridge between high-level
Because ubios-udapi-server is tasked with applying complex firewall rules and processing traffic telemetry, it can occasionally experience high CPU or memory utilization. Common Causes of Resource Spikes UDAPI implements a JSON-RPC 2
A community member investigating this on a Russian Ubiquiti forum noted they could add DHCP options for the LAN, but the real challenge was finding the correct section to add custom options for the WAN interface. This underscores the server's flexibility and the need for careful exploration when customizing beyond the standard UI.
For advanced users using SSH access, the state of the server can be inspected in /config/ubios-udapi-server/ubios-udapi-server.state . While manually stopping or modifying this service is generally discouraged—as it can "break" the router's ability to process traffic—it is a primary point of investigation for the Ubiquiti Community and support teams when diagnosing persistent connectivity "ghosts".
: Fine-tuning IPSec VPN configurations to work through complex network address translation (NAT) scenarios, or monitoring and adjusting WireGuard peers directly.