I am trying this code and getting error message saying 'In order to perform this operation a successful bind must be completed on the connection., data 0, vece '

Code:
import javax.naming.*;
import javax.naming.directory.*;
import java.util.Hashtable;

Hashtable env= new Hashtable(11);
                        env.put(Context.SECURITY_AUTHENTICATION,"none");
                        env.put(Context.SECURITY_PRINCIPAL,"UID=username,OU=USERS,OU=NHQ,DC=GC,DC=CA");//
                        env.put(Context.SECURITY_CREDENTIALS, "password");//Password
                        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
                        env.put(Context.PROVIDER_URL,"ldap://csc-scc.gc.ca");
                       
                        DirContext ctx = new InitialDirContext(env);
//                       See which server was used
                        System.out.println("ctx info: " +ctx.getEnvironment().get(Context.PROVIDER_URL));

                        //String[] sAttrIDs = new String[2];

                        Attributes attr = ctx.getAttributes("sAMAccountName=xxx-xxx\\username,OU=USERS,OU=NHQ,DC=GC,DC=CA");

                        System.out.println("Domain Name:"+ attr.get("name").get());