前几天，有了新的接口性能测试需求，同事在添加 HTTP请求 后，运行时响应信息如下所示：
java.net.SocketException: Permission denied: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:643)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:505)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:328)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1141)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1130)
at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:431)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:258)
at java.lang.Thread.run(Thread.java:745)
经过问询谷大爷，查了一下，发现只要在启动脚本里添加 -Djava.net.preferIPv4Stack=true 参数，将其网络偏爱设置为 IPv4。设置如下所示：
启动配置文件路径：{JMeter 主目录}\bin
Linux 启动配置文件：jmeter.sh，添加如下启动参数设置：
export JVM_ARGS="-Djava.net.preferIPv4Stack=true"
Winows 启动配置文件：jmeter.bat，添加如下启动参数设置：
set JVM_ARGS="-Djava.net.preferIPv4Stack=true"
重新启动 JMeter 运行脚本即可解决之前的报错。
后记：
问题解决后，作为一名专职测试人员，我问自己难道是开发对此接口设置了 IPv4 偏好 ？！想想不应该呀。。。为防止用户在访问上述接口出现此问题，我还是去找相应的接口开发人确认了一下。经确认其未进行相应的设置，同时查看源码遍历 IPv 信息，也未发现有相应的设定！
新的问题出现了，是什么导致了其访问接口的时候，偏好了 IPv4 的呢 ？？？？
正所谓，功夫不负有心人！后经努力，查询 JDK 的 Networking Properties 才得到了最终的答案，如下所示。
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" 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后来查询了一下 JMeter 的用户手册，发现可以通过修改其配置文件，实现在任意系统的移植，而不需要改每个系统对应的启动文件。
系统配置文件：{JMeter 主目录}\bin\system.properties，将 java.net.preferIPv4Stack 设置为 true 即可。
至此，此文顺利完结，希望此文能够给初学 JMeter 的您一份参考。
最后，非常感谢亲的驻足，希望此文能对亲有所帮助。热烈欢迎亲一起探讨，共同进步。非常感谢！ ^_^