EOFError on Red Hat Satellite Proxy server when clients try to connect

Issue

• When attempting to run rhn_check from a Proxy client, following error can be observed:

  # rhn_check
  An error has occurred:
  Internal Server Error
  See /var/log/up2date for more information
  

• Traceback errors in /var/log/httpd/error_log on the Proxy server:

  Exception Handler Information
  Traceback (most recent call last):
    File "/usr/share/rhn/proxy/apacheServer.py", line 66, in __call__
      ret = f(req)
    File "/usr/share/rhn/proxy/apacheHandler.py", line 349, in handler
      ret = handlerObj.handler()
    File "/usr/share/rhn/proxy/broker/rhnBroker.py", line 180, in handler
      authToken = self.proxyAuth.check_cached_token()
    File "/usr/share/rhn/proxy/rhnProxyAuth.py", line 117, in check_cached_token
      oldToken = self.get_cached_token()
    File "/usr/share/rhn/proxy/rhnProxyAuth.py", line 134, in get_cached_token
      return shelf[key]
    File "/usr/share/rhn/proxy/rhnProxyAuth.py", line 386, in __getitem__
      val = rhnCache.get(rkey, missing_is_null=0)
    File "/usr/share/rhn/common/rhnCache.py", line 78, in get
      return cache.get(name, modified)
    File "/usr/share/rhn/common/rhnCache.py", line 354, in get
      return cPickle.loads(pickled)
  EOFError
  

• rhn_check returns error 500 on client registered with Red Hat Proxy.