Connect to DB2 on Windows 2000

I have DB2 7.2 installed on my Windows 2000. 

Can I access it from as/400 ?

I'm trying to access it from as/400 with something like this:

public class ExtDB2 {
 static final String DRIVER_NAME = "com.ibm.db2.jdbc.app.DB2Driver";
 static final String DATABASE_URL = "jdbc:db2://MyPC/MyDB";
 public static void main(String[] args) {
  try {
   Class.forName(DRIVER_NAME);
   Connection conn = null;
   conn = DriverManager.getConnection(DATABASE_URL, "user", "password");
....
....

I've been asked to add "MyPC" in the Relational Database and I did so.

Now I get the error:
com.ibm.db2.jdbc.app.DB2DBException: Communication error . . . .

Thanks for help.

Adele.