satellite-sync is failing with either "ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error" or "ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon"

Issue

When running satellite-sync without the --no-ssl option we get these errors:

03:46:47    Retrieving / parsing short package metadata: rhel-x86_64-client-workstation-5 (6508)
03:48:48 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-client-workstation-5', 1390333341): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
03:49:38    Retrieving / parsing short package metadata: rhel-x86_64-es-4 (27)
03:51:04    Retrieving / parsing short package metadata: rhel-x86_64-server-5 (48)
03:53:04 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-5', 1390852290): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
03:55:05 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-5', 1390852290): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
03:57:04    Retrieving / parsing short package metadata: rhel-x86_64-server-6 (12174)
03:59:04 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-6', 1390901115): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
04:01:05 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-6', 1390901115): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
04:03:05 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-6', 1390901115): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
04:05:06 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-6', 1390901115): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
04:07:07 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-6', 1390901115): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>
+++ sending log as an email +++

SYNC ERROR:

(Check logs/email for potentially more detail)

ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-x86_64-server-6', 1390901115): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 502 Proxy Error>

• When using the --no-ssl option we get these errors:

00:36:02 Retrieving short package metadata (used for indexing)
00:36:03    Retrieving / parsing short package metadata: rhel-i386-as-4 (8563)
00:36:08 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-i386-as-4', 1379532043): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon>
00:36:13 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-i386-as-4', 1379532043): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon>
00:36:17 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-i386-as-4', 1379532043): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon>
00:36:22 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-i386-as-4', 1379532043): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon>
00:36:26 ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-i386-as-4', 1379532043): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon>
00:36:27
SYNC ERROR:

Exception reported from satellite.example.com
Time: Tue Jan 28 00:36:27 2014
Exception type spacewalk.satellite_tools.syncLib.RhnSyncException

Exception Handler Information
Traceback (most recent call last):
  File "/usr/bin/satellite-sync", line 139, in main
    return satsync.Runner().main()
  File "/usr/lib/python2.4/site-packages/spacewalk/satellite_tools/satsync.py", line 225, in main
    ret = method()
  File "/usr/lib/python2.4/site-packages/spacewalk/satellite_tools/satsync.py", line 311, in _step_short
    return self.syncer.processShortPackages()
  File "/usr/lib/python2.4/site-packages/spacewalk/satellite_tools/satsync.py", line 881, in processShortPackages
    stream_loader.process(package_ids)
  File "/usr/lib/python2.4/site-packages/spacewalk/satellite_tools/satsync.py", line 2002, in process
    stream = self.loader(*args)
  File "/usr/lib/python2.4/site-packages/spacewalk/satellite_tools/xmlWireSource.py", line 235, in getChannelShortPackagesXmlStream
    (self.systemid, channel, last_modified))
  File "/usr/lib/python2.4/site-packages/spacewalk/satellite_tools/xmlWireSource.py", line 155, in _openSocketStream
    stream = apply(func, params)
  File "/usr/lib/python2.4/site-packages/rhn/rpclib.py", line 654, in __call__
    return self._send(self._name, args)
  File "/usr/lib/python2.4/site-packages/rhn/rpclib.py", line 390, in _request
    raise pe
RhnSyncException: ERROR: server.dump.channel_packages_short('<the systemid>', 'rhel-i386-as-4', 1379532043): <ProtocolError for satellite.rhn.redhat.com /SAT-DUMP: 403 MediaTypeCommon>