Timeout for activity checks, expressed in milliseconds. If, after a warning that the connection is stalled (see ProbeWarningMillis), no data has been received on the stream connection for this further time, 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