Binance Testnet DNS Resolution Failure (testnet.binance.vision) Causes “Exchange not connected”

[denisrodmanareum]

026-01-25 13:02:39.683 | INFO | trading.exchange_factory:get_client:26 - 🔄 Switching Exchange Client to: BINANCE 2026-01-25 13:02:39.696 | ERROR | trading.binance_client:initialize:34 - ❌ Binance initialization failed: Cannot connect to host testnet.binance.vision:443 ssl:default [Could not contact DNS servers] 2026-01-25 13:02:39.697 | ERROR | app.main:lifespan:130 - Failed to initialize: Cannot connect to host testnet.binance.vision:443 ssl:default [Could not contact DNS servers] INFO: Application startup complete. 2026-01-25 13:02:46.959 | ERROR | app.api.trading:get_balance:211 - Failed to get balance: 503: Exchange not connected INFO: 127.0.0.1:56701 - "GET /api/trading/balance HTTP/1.1" 500 Internal Server Error 2026-01-25 13:02:46.962 | ERROR | app.api.positions:get_positions:23 - Failed to get positions: 503: Exchange not connected INFO: 127.0.0.1:56702 - "GET /api/positions HTTP/1.1" 500 Internal Server Error

[carlosmiei]

Hello @denisrodmanareum,

testnet is discontinued can you please try to use the demo mode instead? (by providing demo=True)

https://demo.binance.com/