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I am trying to bind the Socket on the client side to any particular local port, in this code I used 20000. Normal connections such as below works just fine. But does not allow for me to choose the local port. hostSocket = new Socket(host,80); So I tried this: hostSocket = new Socket(host, 80, InetAddress.getLocalHost(), 20000); and this: hostSocket = new Socket(); hostSocket.bind(new InetSocketAddress("localhost", 20000)); hostSocket.connect(new InetSocketAddress(host,80)); But they both leave me with this exception... in the second case the exception occurred on the connect call. I'm not really sure what I am missing and I would love some pointers. java.net.SocketException: Invalid argument or cannot assign requested address at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384) at java.net.Socket.connect(Socket.java:546) at java.net.Socket.connect(Socket.java:495) at com.mb.proxy.netflix.NetflixPrefetchingAgent.connect(NetflixPrefetchingAgent.java:98) at com.mb.proxy.netflix.NetflixPrefetchingAgent.run(NetflixPrefetchingAgent.java:164) at java.lang.Thread.run(Thread.java:679) Exception in thread "Thread-19" java.lang.NullPointerException at com.mb.proxy.netflix.NetflixPrefetchingAgent.prefetchChunk(NetflixPrefetchingAgent.java:272) at com.mb.proxy.netflix.NetflixPrefetchingAgent.run(NetflixPrefetchingAgent.java:176) at java.lang.Thread.run(Thread.java:679)

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