Description of problem:
rhnpush utility from SW1.0 can not push to Satellite 5.3.0. I'm getting:

# rhnpush -vvv --channel=jhutar1 --username=admin --password=admin --server=https://rhndev4.s390.bos.redhat.com/APP /mnt/redhat/released/RHEL-5-Server/U5/i386/os/Server/module-init-tools-3.3-0.pre3.1.60.el5.i386.rpm 
Connecting to https://rhndev4.s390.bos.redhat.com/APP
url is https://rhndev4.s390.bos.redhat.com/PACKAGE-PUSH
Result codes: 200 OK
Computing checksum and package Info .This may take sometime ...
While running 'packages.getPackageChecksumBySession': caught
server.apacheRequest.UnknownXML : Invalid request received (function: packages.getPackageChecksumBySession invalid).


Version-Release number of selected component (if applicable):
Server: Satellite 5.3.0 (+ erratas)
Client: redhat-release-server-5.90Server-6.0.0.28.el6.i686
        rhnpush-5.4.13.1-1.fc12.noarch


How reproducible:
always


Steps to Reproduce:
1. client # rhnpush -vvv --channel=jhutar1 --username=admin --password=admin --server=https://rhndev4.s390.bos.redhat.com/APP /mnt/redhat/released/RHEL-5-Server/U5/i386/os/Server/module-init-tools-3.3-0.pre3.1.60.el5.i386.rpm
2. server # 


Actual results:
Push fails and this is on server side in /var/log/httpd/error_log:
[...]
Exception reported from rhndev4.s390.bos.redhat.com
Time: Fri Jun  4 10:01:30 2010
Exception type server.apacheRequest.UnknownXML
Exception while handling function packages.getPackageChecksumBySession
Request object information:
URI: /APP
Remote Host: dell-pe6950-01.rhts.eng.bos.redhat.com
Server Name: rhndev4.s390.bos.redhat.com:443
Headers passed in:
        Accept-Encoding: identity
        Content-Length: 396
        Host: rhndev4.s390.bos.redhat.com
        content-encoding: x-gzip
        content-transfer-encoding: binary
        content-type: application/binary
        user-agent: rhn.rpclib.py/$Revision$
        x-client-version: 1
        x-info: RPC Processor (C) Red Hat, Inc (version $Revision$)
        x-rhn-transport-capability: follow-redirects=3
        x-transport-info: Extended Capabilities Transport (C) Red Hat, Inc (version $Revision$)
Extra information about this error:
Response sent back to the caller:
While running 'packages.getPackageChecksumBySession': caught
server.apacheRequest.UnknownXML : Invalid request received (function: packages.getPackageChecksumBySession invali
d).



Exception Handler Information
Traceback (most recent call last):
  File "/usr/share/rhn/server/apacheRequest.py", line 118, in call_function
    func = self.method_ref(method)
  File "/usr/share/rhn/server/apacheRequest.py", line 439, in method_ref
    raise UnknownXML("function: %s invalid" % (method,))
UnknownXML: Invalid request received (function: packages.getPackageChecksumBySession invalid).


Expected results:
Should work.