Freeboard open too many connections to a MQTT broker

[naamah75]

I'm facing a big problem when try to connect to an MQTT broker (CloutMQTT) via secure websocket.
CloudMQTT would accept max 5 concurrent connections and Freeboard seems to open more than 5 (simultaneous) connection to this broker; in this way the broker definitively deny the connection.

2018-12-09 17:13:44: Client connection from 79.43.134.88 denied: max_connections exceeded.
2018-12-09 17:13:45: Client connection from 79.43.134.88 denied: max_connections exceeded.
2018-12-09 17:13:45: Client connection from 79.43.134.88 denied: max_connections exceeded.
2018-12-09 17:13:46: Client connection from 79.43.134.88 denied: max_connections exceeded.

How to resolve this issue?