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Use the netcat tool (nc) to test your connectivity. Do this:
and show us the exact output.
# dig xmlrpx.rhn.redhat.com # tracepath xmlrpc.rhn.redhat.com # nc -vz xmlrpc.rhn.redhat.com/XMLRPC 443
This recipe checks:
<li>Can your DNS resolve the server?
<li>Can you at least ping the server? If not, how far do you get?
<li>Do you have a firewall that blocks the https post (443).