Selenium RC 403 Error - Forbidden for proxy

I'm trying to run Selenium RC 1.0.3 using Java 6, JUnit 4, and Eclipse on Snow Leopard.

Here is my test class, from the Selenium docs:

public class TestCase extends SeleneseTestCase {

  @Before
  public void before() throws Exception {
    setUp("http://www.google.com/", "*firefox");
  }

  @Test
  public void test() {
    selenium.open("/");
    selenium.type("q", "selenium rc");
    selenium.click("btnG");
    selenium.waitForPageToLoad("30000");
    assertTrue(selenium.isTextPresent("Advanced search"));
  }
}

I receive the following error, which occurs at the time that selenium.open() is called:

11:16:59.916 INFO - Got result: 
XHR ERROR: URL = http://localhost:4444/ Response_Code = 403 
Error_Message = Forbidden+for+Proxy on session a8cf1e0bd5ed42c5a4df0c25ec5f5286
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I've tried (finding various suggestions on the web) replacing *firefox with *chrome or *firefox, replacing http with https and adding selenium.start(), but none have helped, or even changed the behavior.

Any ideas?

EDIT: The selenium-server is running, and the local firewall is disabled.

OK, here's a solution, without any understanding: If the @Before method is removed, and the call to setUp() is moved into the @Test method, then it works:

@Test
public void test() throws Exception {
  setUp("http://www.google.com/", "*chrome");
  selenium.open("/");
  selenium.type("q", "selenium rc");
  selenium.click("btnG");
  selenium.waitForPageToLoad("30000");
  assertTrue(selenium.isTextPresent("Advanced search"));
}

But here is a better solution, based on understanding:

import com.thoughtworks.selenium.SeleneseTestCase;

public class TestCase extends SeleneseTestCase {

  public void setUp() throws Exception {
    setUp("http://www.google.com/", "*firefox");
  }

  public void testAuto() throws Exception {
    selenium.open("/");
    selenium.type("q", "selenium rc");
    selenium.click("btnG");
    selenium.waitForPageToLoad("30000");
    assertTrue(selenium.isTextPresent("Advanced search"));
  }
}

It turns out that SeleneseTestCase extends TestCase from JUnit 3. I had upgraded the documentation example to JUnit 4 without thinking about what problems may be caused.