I've same problem with FC2.
#up2date
Error communicating with server. The message was:
Error Message:
Please run rhn_register (or up2date --register on Red Hat Linux 8.0)
as root on this client
Error Class Code: 9
Error Class Info: Invalid System Credentials.
Explanation:
An error has occurred while processing your request. If this problem
persists please enter a bug report at bugzilla.redhat.com.
If you choose to submit the bug report, please be sure to include
details of what you were trying to do when this error occurred and
details on how to reproduce this problem.
______________________________________________________
Error Message:
Service not enabled for system profile: "FC2"
Error Class Code: 31
Error Class Info:
This system does not have a valid entitlement for Red Hat Network.
Please visit
https://rhn.redhat.com/network/systems/entitlements.pxt
or login at
https://rhn.redhat.com, and from the "Systems" tab,
select "System Entitlements" to enable RHN service for this system.
Explanation:
An error has occurred while processing your request. If this problem
persists please enter a bug report at bugzilla.redhat.com.
If you choose to submit the bug report, please be sure to include
details of what you were trying to do when this error occurred and
details on how to reproduce this problem.
______________________________________________
What I've to do?