Radiator Server Documentation — v10.34.2

Emission

Log level: DEBUG

Per-request tracing: No

Promotion: WARN

Logged when a background connection attempt fails while maintaining the configured minimum RADIUS backend connections. The error field describes the connection failure. Without an alerts block, DNS, TCP connection, and TLS handshake timeouts are reported only by their own messages. When an alerts block enables backend incidents, failures across this backend update one connectivity incident until all required connections recover.

Repeated failures usually mean the backend is unavailable or DNS, routing, TLS, or local socket setup is failing.

Check the error and the backend connection min setting. Lower min only when maintaining warm connections is not required.