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  • Linux下防火墙开启相关端口及查看已开启端口

    最近利用Apache Mina实现了一个http服务,发布到linux下发现无法访问,通过HttpClient来发送http请求时,报如下错误:

    Exception in thread "main" org.apache.http.conn.HttpHostConnectException: Connection to http://10.5.20.96:8011 refused
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:190)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
        at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:640)
        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:1066)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:1044)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:1035)
        at com.tudou.findlabel.entrance.ClientWithResponseHandler.main(ClientWithResponseHandler.java:52)
    Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
        ... 8 more
    原来是因为linux下没有开启对8011的端口访问权限造成的。通过下面的命令可以开启允许对外访问的网络端口:

    /sbin/iptables -I INPUT -p tcp --dport 8011 -j ACCEPT #开启8011端口 
    /etc/rc.d/init.d/iptables save #保存配置 
    /etc/rc.d/init.d/iptables restart #重启服务 
    查看端口是否已经开放
    /etc/init.d/iptables status 
    结果如下 

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  • 原文地址:https://www.cnblogs.com/dlts26/p/2668887.html
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