08-22-2011
Check that your system clock is more than 5 minutes skewed from the RHN server clock. You can sometimes get these types of errors if the clocks differ too much.
Also it looks like you may have an old certificate. As far as I recall you need RHN-ORG-TRUSTED-SSL-CERT nowadays and not RHNS-CA-CERT which you seem to have according to your /etc/sysconfig/rhn/up2date file.
I am not in front of a RHEL system at present so cannot check.
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