pos 访问超时 windows连接超时 497 天后未关闭 TIME_WAIT

问题描述：

nginx连接后台tomcat程序 一直报错

nginx的error日志如下

// :: [error] #: * upstream timed out (: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 42.234.50.129, server: localhost, request: "POST ……", upstream: "http://10.10.:8103/JWebService/JService", host: ""
// :: [error] #: * upstream timed out (: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 125.45.125.107, server: localhost, request: "", upstream: "http://10.10.:8202/JWebService/JService", host: ""
// :: [error] #: * upstream timed out (: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 42.233.94.168, server: localhost, request: "", upstream: "http://10.10.:8201/JWebService/JService", host: ""
// :: [error] #: * upstream timed out (: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 125.46.40.38, server: localhost, request: "", upstream: "http://10.10.:8202/JWebService/JService", host: ""
// :: [error] #: * upstream timed out (: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 219.154.200.226, server: localhost, request: "", upstream: "http://10.10.:8203/JWebService/JService", host: ""

可以看到 用户访问nginx后，nginx将请求转发给 后端tomcat服务器，一直报超时

tomcat无返回数据。

初步判断是tomcat的问题，重启tomcat后问题依旧存在

通过查询得知，服务器使用的windows版本是

通过各种渠道询问后得知，微软官网的一个公告

从系统启动，Windows Vista 中、 在 Windows  中，Windows Server  中和在 Windows Server  R2 中的  天后未关闭 TIME_WAIT 状态的所有 TCP/IP 端口

症状
在计算机上运行的 Windows Vista，Windows ，Windows Server  中，还是 Windows Server  R2，您遇到以下问题。

问题
在系统启动时从  天后所有在TIME_WAIT状态的 TCP/IP 端口都不会被关闭。因此， TCP/IP 端口可能会被用光，并且可能不会创建新的 TCP/IP 会话。

注意：这台计算机某些与网络相关的操作可能受此问题。例如，您试图使用某些远程管理工具来管理已超过  天运行的基于 Windows Server  的域控制器。在此示例中，远程管理工具无法连接到域控制器。

查看服务器的开机时间

开机了499天，问题正好是在两天前出现的，正是公告中所说的497天后

确定问题！！！

微软官网公告地址：
https://support.microsoft.com/zh-cn/help/2553549/all-the-tcp-ip-ports-that-are-in-a-time-wait-status-are-not-closed-aft?tdsourcetag=s_pctim_aiomsg

解决方法：

补丁包已经无法下载了，所有直接使用微软官方的更新程序