服务器启动socket服务报错 java.net.BindException Cannot assign requested address

错误信息如下：

Exception in thread "main" java.net.BindException: Address already in use        at sun.nio.ch.Net.bind0(Native Method)        at sun.nio.ch.Net.bind(Net.java:433)        at sun.nio.ch.Net.bind(Net.java:425)        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)        at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:104)        at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:464)        at io.netty.channel.DefaultChannelPipeline$HeadHandler.bind(DefaultChannelPipeline.java:1032)        at io.netty.channel.ChannelHandlerInvokerUtil.invokeBindNow(ChannelHandlerInvokerUtil.java:99)        at io.netty.channel.DefaultChannelHandlerInvoker.invokeBind(DefaultChannelHandlerInvoker.java:196)        at io.netty.channel.DefaultChannelHandlerContext.bind(DefaultChannelHandlerContext.java:366)        at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:898)        at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:189)        at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:309)        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:318)        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:353)        at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:794)        at java.lang.Thread.run(Thread.java:748)

服务器是阿里云的linux系统，socket是基于netty的socket服务端

socket服务的ip是服务器外网ip，端口是8689

经查看该端口并没有被占用

测试使用内网ip与相同端口启动服务启动成功

经过排查，最终的结果是，这个服务器使用的阿里云专用网络，直接用内网ip启动socket服务， 外部可以使用外网ip直接访问。

最后就是 ： 用内网ip与8689端口启动socket服务端， 客户端通过 ws://服务器外网ip:8689 连接即可