Connection closed by foreign host.

回答: "Connection closed by foreign host"的错误提示意味着客户端与服务器之间的TCP连接被远程主机关闭了。这种情况通常发生在之前连接过的情况下，再次连接时出现突然断开。这个问题通常不与防火墙有关（尽管也可能与防火墙有关，建议检查一下）。当客户端突然断开时，服务器端的TCP连接处于半打开状态。当下一次同一客户端再次建立TCP连接时，服务器会检测到这个半打开的TCP连接，并向客户端发送一个置位RST的TCP报文，导致客户端显示"connection closed by foreign host"。这是TCP协议本身的保护措施，不是错误。解决这个问题的方法是重新连接服务器，即可重新建立TCP连接。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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