Policy File is being served, but never recognized

Questions & Answers
1

I am trying to serve a crossdomain policy file from a Java server to the Unity webplayer. When the webplayer connects to the server, the console (server-side) shows: “ServingPolicyFile CONNECTION MADE”, but the webplayer throws an exception:

SecurityException: Unable to connect, as no valid crossdomain policy was found
System.Net.Sockets.Socket.Connect_internal (IntPtr sock, System.Net.SocketAddress sa, System.Int32& error, Boolean requireSocketPolicyFile)
System.Net.Sockets.Socket.Connect_internal (IntPtr sock, System.Net.SocketAddress sa, System.Int32& error)
System.Net.Sockets.Socket.Connect (System.Net.IPAddress[] addresses, Int32 port)
System.Net.Sockets.Socket.Connect (System.String host, Int32 port)

Here is the server code (Java)

public class ServingPolicyFile {

    final private static int PORT = 843;
    final private static String POLICY_FILE_FORMAT = "<?xml version='1.0'?><cross-domain-policy><allow-access-from domain=\"%s\" to-ports=\"%s\"/></cross-domain-policy>\0";
    final private ExecutorService _executor = Executors.newSingleThreadExecutor();
    final private ServerSocket _servingSocket;
    final private String _policyFile;

    public ServingPolicyFile(String policyFile) throws IOException {
        _servingSocket = new ServerSocket(PORT);
        _policyFile = policyFile;
    }

    public ServingPolicyFile(int port) throws IOException {
        this(String.format(POLICY_FILE_FORMAT, "*", port));
    }

    public void close() throws IOException {
        _executor.shutdownNow();
        _servingSocket.close();
    }

    public void start() {
        _executor.submit(() -> {
            while (true) {
                try (Socket socket = _servingSocket.accept(); PrintWriter out = new PrintWriter(socket.getOutputStream(), true)) {
                    System.out.println("ServingPolicyFile CONNECTION MADE");
                    out.println(_policyFile);
                }
            }
        });
    }
}

Does anyone know what the issue might be?

I tried serving the EXACT policy file (copy & pasted) from the unity docs, but that didn’t work either.

2

I was able to fix my issue. I was sending the policy file correctly, but my application was crashing. I misdiagnosed this as the policy file failing.

I found this information by checking the Editor log file. You can find this on your machine by reading this: