Java Database Connectivity (JDBC)

I am currently developping a SWING application generated with NetBeans 6.1 which connects to either a MySQL DB or a PostgresSQL DB, both hosted by a Linux server.

The application runs just FINE on Solaris/SPARC, Solaris/x86 and Linux/x86.
The problems come with Windows/x86 : the call to DriverManager.getConnection() just stalls, no error, no timeout, no exception.

After investigating a little bit more I found some "funny" behaviors that I submit here for comments:

The drivers loaded since the main() function using:
Class.forName("com.mysql.jdbc.Driver");
Class.forName("org.postgresql.Driver");

The application gets connected to the DB with the following connection code :

try {
DriverManager.getConnection( "jdbc:mysql://192.168.2.3:3306/ZEDB", "user", "pwd" );
DriverManager.getConnection( "jdbc:postgresql://192.168.2.3:5432/ZEDB", "user", "pwd" );
}
catch (Exception x) { [...] }

And the results are (tried with JDK 5u16 and JDK 6u7)

- On Windows :

-> OK in a console Application
-> OK in a Swing/AWT Application if the connection code is in the main function
-> NOK in a Swing/AWT Application if the connection code is placed anywhere within a SWING Form AND server is remote,
-> Last case if OK if server is "localhost" (tested only with MySQL -for Windows- however ).

- On Linux or Solaris : OK on any case

Any idea ?

- Dom