When the user update new RHUA entitlement certificate,why rhua does not sync with RHN ?

Issue

• When the user update new RHUA entitlement certificate,why rhua does not sync with RHN ?
• The user update new RHUA entitlement certificate and runs sync repository but repository did not sync and failed.

  # cat /var/log/pulp/pulp.log
2013-08-07 19:37:40,997 2779:140325542676224: pulp.server.tasking.task:ERROR: task:478 Task failed: Task dd53df30-fc6a-11e2-87a5-001a4a40dde3: _sync(rhel-5-server-rhui-supplementary-rpms-5Server-x86_64, synchronizer=<pulp.server.api.sync
hronizers.YumSynchronizer object at 0x7fa02c02c950>, skip=SON([(u'distribution', 1)]), progress_callback=<bound method RepoSyncTask.progress_callback of <pulp.server.api.repo_sync_task.RepoSyncTask object at 0x7fa02c02c990>>)
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/pulp/server/tasking/task.py", line 424, in run
    result = self.callable(*self.args, **self.kwargs)
  File "/usr/lib/python2.6/site-packages/pulp/server/api/repo_sync.py", line 272, in _sync
    progress_callback, synchronizer, max_speed, threads)
  File "/usr/lib/python2.6/site-packages/pulp/server/api/repo_sync.py", line 355, in fetch_content
    progress_callback, max_speed, threads)
  File "/usr/lib/python2.6/site-packages/pulp/server/api/synchronizers.py", line 163, in sync
    max_speed=max_speed, threads=threads)
  File "/usr/lib/python2.6/site-packages/pulp/server/api/synchronizers.py", line 778, in remote
    verify_options=verify_options)
  File "/usr/lib/python2.6/site-packages/grinder/RepoFetch.py", line 144, in fetchYumRepo
    self.setupYumInfo()
  File "/usr/lib/python2.6/site-packages/grinder/RepoFetch.py", line 108, in setupYumInfo
    info.setUp()
  File "/usr/lib/python2.6/site-packages/grinder/YumInfo.py", line 353, in setUp
    skip=self.skip)
  File "/usr/lib/python2.6/site-packages/grinder/activeobject.py", line 82, in __call__
    return self.object(self, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/grinder/activeobject.py", line 267, in __call__
    return self.__call(method, args, kwargs)
  File "/usr/lib/python2.6/site-packages/grinder/activeobject.py", line 243, in __call
    return self.__rmi(method.name, args, kwargs)
  File "/usr/lib/python2.6/site-packages/grinder/activeobject.py", line 136, in __rmi
    raise Exception(ex)
Exception: Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/grinder/activeobject.py", line 429, in process
    retval = method(*args, **kwargs)

  File "/usr/lib/python2.6/site-packages/grinder/YumInfo.py", line 97, in getDownloadItems
    self.__getRepoData()

  File "/usr/lib/python2.6/site-packages/grinder/YumInfo.py", line 179, in __getRepoData
    for ftype in self.__getRepoXmlFileTypes():

  File "/usr/lib/python2.6/site-packages/grinder/Retry.py", line 44, in wrapped
    raise e

RepoError: Cannot retrieve repository metadata (repomd.xml) for repository: . Please verify its path and try again