title: IOError: unsupported XML-RPC protocol while running yum command
body: <p>When I try to turn any yum command I get the follwing message. I disabled and enabled SSL before this error occurred. As the system said RHNS-CA-CERT has expired, I removed the certificate and downloaded it using wget command. Then I tried to update the certificate using the yum command and that's where the problem started.</p>
  
  <p>Here's the error message:</p>
  
  <pre><code>Loaded plugins: rhnplugin
  Exception RuntimeError: 'maximum recursion depth exceeded in __subclasscheck__' in &lt;type 'exceptions.AttributeError'&gt; ignored
  Traceback (most recent call last):   
    File "/usr/bin/yum", line 29, in &lt;module&gt;
      yummain.user_main(sys.argv[1:], exit_code=True)
    File "/usr/share/yum-cli/yummain.py", line 285, in user_main
      errcode = main(args)
    File "/usr/share/yum-cli/yummain.py", line 105, in main
      base.getOptionsConfig(args)
    File "/usr/share/yum-cli/cli.py", line 228, in getOptionsConfig
      self.conf
    File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 891, in &lt;lambda&gt;
      conf = property(fget=lambda self: self._getConfig(),
    File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 362, in _getConfig
      self.plugins.run('init')
    File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 184, in run
      func(conduitcls(self, self.base, conf, **kwargs))
    File "/usr/share/yum-plugins/rhnplugin.py", line 118, in init_hook
      login_info = up2dateAuth.getLoginInfo(timeout=timeout)
    File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 219, in getLoginInfo
      login(timeout=timeout)
    File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 170, in login
      server = rhnserver.RhnServer(timeout=timeout)
    File "/usr/share/rhn/up2date_client/rhnserver.py", line 154, in __init__
      timeout=timeout)
    File "/usr/share/rhn/up2date_client/rpcServer.py", line 160, in getServer
      timeout=timeout)
    File "/usr/lib/python2.6/site-packages/rhn/rpclib.py", line 169, in __init__
      self._reset_host_handler_and_type()
    File "/usr/lib/python2.6/site-packages/rhn/rpclib.py", line 315, in _reset_host_handler_and_type
      raise IOError, "unsupported XML-RPC protocol"
  IOError: unsupported XML-RPC protocol
  </code></pre>