Linux(Redhat 7.5) 패치

Redhat 7.5 서버를 업데이트하려고 하는데 다음 오류가 발생합니다.

Loaded plugins: langpacks, rhnplugin
There was an error communicating with RHN.
Red Hat Satellite or RHN Classic support will be disabled.
Error communicating with server. The message was:

Error Message:
    Please run rhn_register 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 consult the Red Hat Customer Portal Knowledge Base
     landing page on common registration Error Class Codes at
     https://access.redhat.com/solutions/17036 for a possible resolution.
     If you choose to open a support case in the Red Hat Customer Portal,
     please be sure to include details of what you were trying to do when
     this error occurred and specifics on how to reproduce this problem.

No packages marked for update

위성에 서버를 등록하려고 했지만 다음 오류가 발생했습니다.

REGISTRATION
------------
* registering
Error communicating with server. The message was:
Connection timed out on readline

*** Error: Registering the system failed.