Flag to enable the use of keep alive messages during data transfers.
During very large transfers some servers timeout, meaning that the transfer is not correctly completed. Most servers can't cope with keep alives being sent during a transfer, so only set this property if you are having timeout problems with very large transfers, and you can't increase the timeout on the server. Use with caution - this may cause messages to arrive out of order. Note that the KeepAlivePeriodSecs property is used to set the interval between keep alives.