How to unregister RHEL Server from RHN (Red Hat Network)

The RHN (Red Hat Network) is a service provided by Red Hat for receiving updates and support for your Red Hat Enterprise Linux installation. A RHEL copy can be added to RHN by executing the rhn_register command. If for some reason you want to unregister a machine from your RHN network login to RHN from http://rhn.redhat.com/ select you system and click “Delete System” located on the top right.

It isn’t over yet because your computer still “thinks” it is a part of RHN network. To unregister the computer a file has to be removed. Login as root user and execute the following command

rm /etc/sysconfig/rhn/systemid

If you aren’t comfortable with the command line open a file browser with super user permissions (root) navigate to /etc/sysconfig/rhn and delete the file systemid. You can execute rhn_register to reregister that system in future.

Before:

[root@server2 yum.repos.d]# yum search dos2unix Loaded plugins: product-id, refresh-packagekit, rhnplugin, security, subscription-manager There was an error communicating with RHN. RHN Satellite or RHN Classic support will be disabled. 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 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. =========================================================================================================== N/S Matched: dos2unix =========================================================================================================== dos2unix.x86_64 : Text file format converter   Name and summary matches only, use "search all" for everything.

[root@server2 yum.repos.d]# rm /etc/sysconfig/rhn/systemid rm: remove regular file `/etc/sysconfig/rhn/systemid'? y

After:

[root@server2 yum.repos.d]# yum search dos2unix Loaded plugins: product-id, refresh-packagekit, rhnplugin, security, subscription-manager This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register. This system is not registered with RHN Classic or RHN Satellite. You can use rhn_register to register. RHN Satellite or RHN Classic support will be disabled. =========================================================================================================== N/S Matched: dos2unix =========================================================================================================== dos2unix.x86_64 : Text file format converter   Name and summary matches only, use "search all" for everything.

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