Executing Selenium Python Script in Python IDE

I tried to execute the below code on Python IDE - I am using selenium RC

from selenium import selenium

import unittest, time, re

class test(unittest.TestCase):
    def setUp(self):
        self.verificationErrors = []
        self.selenium = selenium("localhost", 4444, "*iexploreproxy", "MY URL/")
        self.selenium.start()

    def test(self):
        sel = self.selenium
        sel.open("MY URL")
        sel.type("username", "krish_test1")
        sel.type("password", "t04ster")
        sel.click("//input[@value='submit']")

    def tearDown(self):
        self.selenium.stop()
        self.assertEqual([], self.verificationErrors)

if __name__ == "__main__":
    unittest.main()

I get the following error messages:

ERROR: test (__main__.test)

Traceback (most recent call last):

  File "C:\Python\test.py", line 12, in test
    sel.open("MY URL")
  File "C:\Python\selenium.py", line 764, in open
    self.do_command("open", [url,])
  File "C:\Python\selenium.py", line 215, in do_command
    raise Exception, data
Exception: XHR ERROR: URL = MY URL Response_Code = 403 Error_Message = Forbidden

Ran 1 test in 4.953s

FAILED (errors=1)

Traceback (most recent call last):

  File "C:\Python\test.py", line 22, in <module>
    unittest.main()
  File "C:\Python27\lib\unittest\main.py", line 95, in __init__
    self.runTests()
  File "C:\Python27\lib\unittest\main.py", line 231, in runTests
    sys.exit(not self.result.wasSuccessful())
SystemExit: True
>>> 

Can anyone help me please?