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POjava.net.SocketException: Invalid argument: connect
 

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  1. POjava.net.SocketException: Invalid argument: connect
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    <p>My new laptop (Alienware m17x) throws a <code>java.net.SocketException: Invalid argument: connect</code> when I run the following basic code:</p> <p>Server.java:</p> <pre><code>public static void main (String[] args) throws Exception { ServerSocket serverSocket = new ServerSocket (8888); Socket socket = serverSocket.accept(); } </code></pre> <p>Client.java:</p> <pre><code>public static void main (String[] args) throws Exception { Socket socket = new Socket ("localhost", 8888); } </code></pre> <p>Every time I run Client.java (after starting Server.java) I get this socket exception. Here's the full trace of the exception:</p> <pre><code>Exception in thread "main" java.net.SocketException: Invalid argument: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.&lt;init&gt;(Unknown Source) at java.net.Socket.&lt;init&gt;(Unknown Source) at Client.main(Client.java:5) </code></pre> <p>I've tried a few things, but no luck the exception is always thrown. Here's what I have concluded:</p> <ul> <li>Changing the port numbers changes nothing.</li> <li>It's not a problem with the network. I have gotten the exception at school and at home.</li> <li>I've reinstalled the JVM and the JDK but no luck.</li> <li>This only occurs on one machine. I have run the same code on my desktop and I have not gotten any exceptions. I am using Windows 7 on both.</li> <li>It is not blocked by a firewall. I have turned my firewalls off and I still have this issue.</li> </ul> <p>What should I do or check for to resolve this issue?</p> <p><strong>EDIT:</strong> route print outputs:</p> <pre><code>=========================================================================== Interface List 15...e4 d5 3d 08 cb 83 ......Killer Wireless-N 1103 Network Adapter 13...d0 df 9a b5 73 dc ......Bluetooth Device (Personal Area Network) 11...d4 be d9 00 10 65 ......Atheros AR8151 PCI-E Gigabit Ethernet Controller (NDIS 6.20) 1...........................Software Loopback Interface 1 17...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface 16...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2 18...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter 19...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3 =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.0.1 192.168.0.191 25 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.0.0 255.255.255.0 On-link 192.168.0.191 281 192.168.0.191 255.255.255.255 On-link 192.168.0.191 281 192.168.0.255 255.255.255.255 On-link 192.168.0.191 281 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.0.191 281 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.0.191 281 =========================================================================== Persistent Routes: None IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 17 58 ::/0 On-link 1 306 ::1/128 On-link 17 58 2001::/32 On-link 17 306 2001:0:4137:9e76:28f3:2721:524f:e2ef/128 On-link 15 281 fe80::/64 On-link 17 306 fe80::/64 On-link 17 306 fe80::28f3:2721:524f:e2ef/128 On-link 15 281 fe80::68c1:bc79:fefa:88a2/128 On-link 1 306 ff00::/8 On-link 17 306 ff00::/8 On-link 15 281 ff00::/8 On-link =========================================================================== Persistent Routes: None </code></pre> <p><strong>EDIT:</strong> As @PhilippeLM and @beny23 made me realize, setting the java system variable java.net.preferIPv4Stack to true solves my problem. However I want a permanent fix. I don't want to specify the system variable every time I run a java application.</p> <p>Here's what I've tried with no luck once again:</p> <ul> <li>Setting my machine preferences to prefer IPv4 by following <a href="http://support.microsoft.com/kb/929852" rel="noreferrer">these steps</a></li> <li>Adding the line <code>java.net.preferIPv4Stack=true</code> to the <code>net.properties</code> file in <code>%JAVA_HOME%\jre\lib</code>.</li> </ul> <p>Is there anything else I can try?</p>
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    1. COVery strange. I've just run your code on my localhost and it works.
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    2. COcan you telnet to the server?
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    3. COI do not call connect. The socket constructor must call it. This is my real code.
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