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Yum commands all give the following error message:

Unable to read consumer identity

It seems however that subscription-manager plugin should be disabled if I use RHN/Satellite?

What to do after registering the server with RHN Satellite with this command?

rhnreg_ks --serverUrl= --activationkey=<key-with-rhel-custom-channel>.

Should I manually disable the Yum subscription-manager plugin on all servers? I am not supposed to subscribe with subscription-manager either, right?

yum repolist
Loaded plugins: katello, product-id, rhnplugin, security, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
repo id                                                                               repo name                                                                                                          status
rhel-x86_64-server-5                                                                  Red Hat Enterprise Linux (v. 5 for 64-bit x86_64)                                                                  13,371
repolist: 13,287

subscription-manager list
    Installed Product Status
ProductName:            Red Hat Enterprise Linux Server
Version:                5.8                      
Arch:                   x86_64                   
Status:                 Not Subscribed           
Starts:                 None                     
Expires:                None                
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up vote 2 down vote accepted

You're right, you need to use the old "rhnplugin" to talk to RHN Classic or RHN Satellite.

The "Unable to read consumer identity" message is harmless, it's just the "subscription-manager" plugin saying the system isn't registered via RHSM.

You can disable the "subscription-manager" plugin on your clients if you like.

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