"The requested URL returned error: 404" when updating clients through RHN proxy

Issue

• While updating clients using RHN proxy from satellite, the clients are not getting updates. We are seeing this error:

Error Downloading Packages:
  libXtst-1.0.99.2-3.el6.x86_64: failed to retrieve getPackage/libXtst-1.0.99.2-3.el6.x86_64.rpm from mserv-rhel-6-x86_64-2011-q3
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
  libICE-1.0.6-1.el6.x86_64: failed to retrieve getPackage/libICE-1.0.6-1.el6.x86_64.rpm from mserv-rhel-6-x86_64-2011-q3
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
  jpackage-utils-1.7.5-3.12.el6.noarch: failed to retrieve getPackage/jpackage-utils-1.7.5-3.12.el6.noarch.rpm from mserv-rhel-6-x86_64-2011-q3
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
  1:java-1.6.0-sun-1.6.0.24-1jpp.1.el6.x86_64: failed to retrieve getPackage/java-1.6.0-sun-1.6.0.24-1jpp.1.el6.x86_64.rpm from clone-2-rhel-x86_64-server-supplementary-6
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
  libXt-1.0.7-1.el6.x86_64: failed to retrieve getPackage/libXt-1.0.7-1.el6.x86_64.rpm from mserv-rhel-6-x86_64-2011-q3
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
  libSM-1.1.0-7.1.el6.x86_64: failed to retrieve getPackage/libSM-1.1.0-7.1.el6.x86_64.rpm from mserv-rhel-6-x86_64-2011-q3
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"
  mtp-stanalone-process-12.3Acadia_Release-1.noarch: failed to retrieve getPackage/mtp-stanalone-process-12.3Acadia_Release-1.noarch.rpm from mserv-portrec-qa
error was [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"