本文探讨了连接超时的常见原因，包括防火墙拦截、网络配置错误、服务器过载及服务器处理线程不足等问题。
摘自stackoverflow
Connection timeouts (assuming a local network and several client machines) typically result from
a) some kind of firewall on the way that simply eats the packets without telling the sender things like "No Route to host"
b) packet loss due to wrong network configuration or line overload
c) too many requests overloading the server 服务端请求超载
d) a small number of simultaneously available threads/processes on the server which leads to all of them being taken. This happens especially with requests that take a long time to run and may combine with c).
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