Timeout for activity checks, expressed in milliseconds. If no data is being received on the stream connection and a keepalive message is late for the sum of ProbeWarningMillis and ProbeTimeoutMillis, then the connection is forcibly closed. 

The default setting is 3000 (3 seconds). 

public: __property long ProbeTimeoutMillis;

public long ProbeTimeoutMillis;

Public Property ProbeTimeoutMillis() As long