WebSocket Error 1006 in Trading Bots: Causes, Diagnosis, and Reconnect Fixes

Trading bots frequently disconnect with WebSocket close code 1006, an abnormal closure that carries no error message or close frame, making it difficult to debug. The code appears when a TCP connection drops unexpectedly due to causes such as proxy idle timeouts, connection resets, network partitions, or rate limiting by exchanges. Because 1006 is reserved by the WebSocket protocol and cannot be sent in a close frame, the bot's library generates it internally to signal that the connection simply vanished. Engineers are advised to treat 1006 as a reconnect trigger rather than a critical error, and to implement application-level ping/pong heartbeats since TCP keepalive alone is too slow to detect dead connections. Logging the time gap between the last received message and the disconnect can help distinguish idle timeouts from sudden drops and guide the appropriate infrastructure fix.