系统出现tcpip临时端口不够用

负责的系统在业务冲刺当天的一台前置机上出现大量的同一个报错

 

错误：

java.net.SocketException: No buffer space available (maximum connections reached?): connect

         at java.net.PlainSocketImpl.socketConnect(Native Method)

         at java.net.PlainSocketImpl.doConnect(Unknown Source)

         at java.net.PlainSocketImpl.connectToAddress(Unknown Source)

         at java.net.PlainSocketImpl.connect(Unknown Source)

         at java.net.SocksSocketImpl.connect(Unknown Source)

         at java.net.Socket.connect(Unknown Source)

         at java.net.Socket.connect(Unknown Source)

         at sun.net.NetworkClient.doConnect(Unknown Source)

         at sun.net.www.http.HttpClient.openServer(Unknown Source)

         at sun.net.www.http.HttpClient.openServer(Unknown Source)

         at sun.net.www.http.HttpClient.<init>(Unknown Source)

         at sun.net.www.http.HttpClient.New(Unknown Source)

         at sun.net.www.http.HttpClient.New(Unknown Source)

         at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)

         at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)

         at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)

         at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)

         at com.cntaiping.intserv.insu.zj.baorong.frontend.query.PacketForward.forword(PacketForward.java:75)

         at com.cntaiping.intserv.insu.zj.baorong.frontend.query.PacketForward.getReturn(PacketForward.java:41)

         at com.cntaiping.intserv.insu.zj.baorong.frontend.query.CheckDiscCollectCBS.httpToCBS(CheckDiscCollectCBS.java:246)

         at com.cntaiping.intserv.insu.zj.baorong.frontend.query.CheckDiscCollectCBS.execute(CheckDiscCollectCBS.java:74)

         at org.quartz.core.JobRunShell.run(JobRunShell.java:213)

         at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557)

 

网上找资料，初步确定是tcpip临时端口不够用造成的，因为socket和http连接都是用的tcpip协议，没建立一次连接都要占用一个空闲临时端口，临时端口不够用则无法建立连接进行通讯

 

解决方案：

1、修改注册表，修改可使用的临时端口上限

参考：http://blog.csdn.net/iihero/article/details/8027733

但是在另一台winserver2003的64位机器上，连接也不少，但是没有出现过这个问题，按理说64位的上面也是默认空闲端口上限也是5000，但是没出现过，关于怎么解释64位的机器上没出现这个问题，如果有机会还要再研究下

 

2、修改注册表，修改time_wait时间

http://elf8848.iteye.com/blog/1739571

 

修改方法：

https://msdn.microsoft.com/zh-cn/library/aa560610(v=bts.10).aspx