why Netty doesn't bind with public IP address & it binds with 127.0.0.1? -

i got in weird situation , can bind serverbootstrap local ip address when tried public ip address throws exception : exception in thread "main" org.jboss.netty.channel.channelexception: failed bind to: /57.88.173.132:5055

can explain me wrong??? btw im using netty 3.6.1

i changed address not real random numbers port real one

here code

private static final string bind_address = "57.88.173.132"; private static final int port = 5055;

public server() {     try     {         startup();     }     catch (ioexception e)     {         e.printstacktrace();     } } private void startup() throws ioexception {     serverbootstrap serbootstrap = new serverbootstrap(new nioserversocketchannelfactory(executors.newcachedthreadpool(),executors.newcachedthreadpool()));      serbootstrap.setpipelinefactory(new pipelinefactory());     serbootstrap.bind(new inetsocketaddress(bind_address,port)); 

here exception thrown

exception in thread "main" org.jboss.netty.channel.channelexception: failed bind to: /57.88.173.132:5055     @ org.jboss.netty.bootstrap.serverbootstrap.bind(serverbootstrap.java:301)     @ com.game.server.server.startup(server.java:33)     @ com.game.server.server.<init>(server.java:22)     @ com.game.server.server.main(server.java:44) caused by: java.net.bindexception: cannot assign requested address: bind     @ sun.nio.ch.net.bind0(native method)     @ sun.nio.ch.net.bind(unknown source)     @ sun.nio.ch.net.bind(unknown source)     @ sun.nio.ch.serversocketchannelimpl.bind(unknown source)     @ sun.nio.ch.serversocketadaptor.bind(unknown source)     @ org.jboss.netty.channel.socket.nio.nioserverboss$registertask.run(nioserverboss.java:193)     @ org.jboss.netty.channel.socket.nio.abstractnioselector.processtaskqueue(abstractnioselector.java:367)     @ org.jboss.netty.channel.socket.nio.abstractnioselector.run(abstractnioselector.java:291)     @ org.jboss.netty.channel.socket.nio.nioserverboss.run(nioserverboss.java:42)     @ org.jboss.netty.util.threadrenamingrunnable.run(threadrenamingrunnable.java:108)     @ org.jboss.netty.util.internal.deadlockproofworker$1.run(deadlockproofworker.java:42)     @ java.util.concurrent.threadpoolexecutor.runworker(unknown source)     @ java.util.concurrent.threadpoolexecutor$worker.run(unknown source)     @ java.lang.thread.run(unknown source) 

this not netty issue.

that's clear java.net.bindexception. cases means port listening other process, detect can use netstat command.

but there few special cases:

note 1 here:

it may related misconfiguration in /etc/hosts. in case, this: 192.168.1.11 localhost instead of 127.0.0.1 localhost

note 2 here:

the error says cannot assign requested address. means need use correct address 1 of network interfaces or 0.0.0.0 accept connections interfaces.

edited.