system registration fails with CommunicationError

Solution Unverified - Updated -

Issue

  • Unable to register a new system with RHN.
  • rhnreg_ks fails with:
A protocol error occurred: Not Found , attempt #1, 
Could not find URL, xmlrpc.rhn.redhat.com:443 
Check server name and/or URL, then retry 

Environment

Red Hat Enterprise Linux 5

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