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TCP keepalive probes only work when the connection is idle. They're not sent when there's unacked send data being retramnsmitted. If the server fails while we're retransmitting we don't break the connection and try to elect and connect to a new server until the very long default conneciton timeouts or the server comes back and the stale connection is aborted. We can set TCP_USER_TIMEOUT to break an unresponsive connection when there's written data. It changes the behavior of the keepalive probes so we rework them a bit to clearly apply our timeout consistently between the two mechanisms. Signed-off-by: Zach Brown <zab@versity.com>