Re: Possible XP Socket Bug?

Knute Johnson <>
Sun, 22 Mar 2009 15:07:53 -0700
John B. Matthews wrote:

In article <49c27e77$0$25089$>,
 Knute Johnson <> wrote:


Thanks very much for trying it. For some reason, I'm still not
getting the exception with this test program although it works in
other programs. It's very strange.

FWIW, I tried it on Mac OS X 10.5.6, Java 1.5.0_16. Inside the LAN, I
saw "Connection refused" for ports without a listener; I saw "true" for
ports with a listener. I used netstat to see the results. I also got
warnings about unauthorized connections from the application firewall.

You might use netstat to see the internal state of whatever port is
giving anomalous results.


public class KJTest {
    public static void main(String[] args) throws Exception {
        int port = args.length > 0 ? Integer.valueOf(args[0]) : 8080;
        Socket s = new Socket("localhost", port);
        System.out.println("connected to: " +
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(
        bw.write("hello world\n");
        System.out.println("data written");


There is something really strange going on. I'm sure this is the same
problem that other fellow was having a few weeks back and I for one
thought he must have something hosed. But now I think their is some
sort of bug somewhere that is causing this.

C:\Documents and Settings\Knute Johnson>java KJTest 10101
connected to: localhost
data written

C:\Documents and Settings\Knute Johnson>netstat -a | grep 10101

C:\Documents and Settings\Knute Johnson>


Knute Johnson
email s/nospam/knute2009/

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