Netbios Name query injected into socket connect.

Question

Folks,
I have a java application which communicates to a networking device via sockets.
It was written with J2SE 1.4, I have ported it to 1.5/5.0.
When issuing a socket connect, I observe that the application/JRE is issuing
several Netbios Name queries to the device.
The device is responding with ICMP Destination unreachable.
After 3 Name queries, the socket connect continues as before (1.4) and the app proceeds as before.
The problem is that the name queries has introduced a 9 second delay to each connect to the appliance and the app now appears unresponsive.
This did not happen with JRE1.4. I have made no changes to the socket code.
Is there a way to stop the name queries?
The getHostName in the JRE connect code below is causing the name queries.
java.net.SocksSocketImpl
    protected void connect(SocketAddress endpoint, int timeout) throws IOException {
     SecurityManager security = System.getSecurityManager();
     if (endpoint == null || !(endpoint instanceof InetSocketAddress))
         throw new IllegalArgumentException("Unsupported address type");
     InetSocketAddress epoint = (InetSocketAddress) endpoint;
     if (security != null) {
         if (epoint.isUnresolved())
          security.checkConnect(epoint.getHostName(),
                          epoint.getPort());
         else
          security.checkConnect(epoint.getAddress().getHostAddress(),
                          epoint.getPort());
     if (server == null) {
         // This is the general case
         // server is not null only when the socket was created with a
         // specified proxy in which case it does bypass the ProxySelector
         ProxySelector sel = (ProxySelector)
          java.security.AccessController.doPrivileged(
              new java.security.PrivilegedAction() {
               public Object run() {
                   return ProxySelector.getDefault();
         if (sel == null) {
           * No default proxySelector --> direct connection
          super.connect(epoint, timeout);
          return;
         URI uri = null;
--->>>>>>>> String host = epoint.getHostName();
         // IPv6 litteral?
         if (epoint.getAddress() instanceof Inet6Address &&
          (!host.startsWith("[")) && (host.indexOf(":") >= 0)) {
          host = "[" + host + "]";
         }Mauro Zallocco.

Answer 1

The resolution of this is to turn off the new proxy server feature in JRE1.5.
You do this by informing the jre that you do not have a default proxy server.
This is done with the following lines of code placed somewhere in you application:
import java.net.ProxySelector;
ProxySelector.setDefault(null);
With this, the NetBIOS name queries do not emanate, and we revert back to the 1.4 behavior.
Mauro Zallocco.