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During the establishment of a tcp connection, If the server returns syn and ack messages, The client does not confirm it for some reason. This is because the server needs to retransmit the syn + ack message and wait for the client's confirmation message until the tcp connection timeout. This state of waiting for the client to confirm the connection is usually called a half-open connection. The half-open connection will be kept in the connection table of the server until the connection is disconnected.疯狂怪兽车，再次来袭，顽皮的捣蛋车，勇敢的怪兽警车，聪明的小火车，看看他们之前会发生哪些有趣的故事吧，《宝宝巴士疯狂怪兽车》陪你过寒假！　　《脱口秀大会》第二季是由腾讯视频、笑果文化联合出品的中国最好笑的脱口秀竞技节目。Before SSL data transmission, both communication parties need to shake hands with SSL, negotiate encryption algorithm to exchange encryption keys, and carry out identity verification. Usually such SSL only needs one time, but there is a Renegotiation option in SSL protocol, through which the secret key can be renegotiated to establish a new secret key.新王朝建立后，旧王朝的余孽往往打着故国皇室遗孤之类的旗号，反叛复国，这样的事情屡见不鲜。