Linux (Redhat 7.5) Patching

I was trying to update a redhat 7.5 server, but it was giving the below error- 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 I tried to register the server with satellite but got the below error- REGISTRATION ------------ * registering Error communicating with server. The message was: Connection timed out on readline *** Error: Registering the system failed.