On RHN Proxy 5.5 registered on RHN Hosted - rhnpush/rhn_package_manager fails with "Not Found"

Issue

• On RHN Proxy 5.5 registered on RHN Hosted - rhnpush/rhn_package_manager fails with "Not Found"
• rhn_package_manager is unable to add packages to a custom channel
• In the broker logs we see :

2012/11/06 05:29:04 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server('Outgoing header', 'user-agent', 'rhn.rpclib.py/$Revision: 190936 $')
2012/11/06 05:29:04 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server('Outgoing header', 'X-RHN-IP-Path', '127.0.0.1')
2012/11/06 05:29:04 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server('Outgoing header', 'X-RHN-Transport-Capability', 'follow-redirects=3')
2012/11/06 05:29:04 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server('Outgoing header', 'x-info', 'RPC Processor (C) Red Hat, Inc (version 195664)')
2012/11/06 05:29:04 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server('Outgoing header', 'content-type', 'application/binary')
2012/11/06 05:29:04 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server('Outgoing header', 'X-RHN-Proxy-Auth', '1023765790::1352182314.35:21600.0:hgJm8tRwN8IFavgYVkEHtA==:localhost')
Not Found
2012/11/06 05:29:05 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server(404,)
2012/11/06 05:29:05 -04:00 3689 127.0.0.1: proxy/rhnShared._proxy2server(,)
2012/11/06 05:29:05 -04:00 3689 127.0.0.1: proxy/rhnShared._serverCommo('HTTP status code (200 means all is well): 404',)
2012/11/06 05:29:05 -04:00 3689 127.0.0.1: proxy/rhnShared._handleServerResponse('Forwarding status 404',)