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ESTABLISHED->CLOSE_WAIT->TIME_WAIT->CLOSED
ESTABLISHED->TIME_WAIT->CLOSE_WAIT->CLOSED
ESTABLISHED->FIN_WAIT_1->FIN_WAIT_2->TIME_WAIT->CLOSED
ESTABLISHED->FIN_WAIT_1->TIME_WAIT->CLOSED
D我猜测是对端突然出了故障,不能正常收发包,本地的保活计时器超时,主动关闭TCP连接,由于对端不会发送ACK,故FIN-WAIT-2状态跳过
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