Fix “This system is not registered with an entitlement server”

Have you encountered the error message ‘This system is not registered with an entitlement server, You can use “rhc” or “subscription-manager” to register’. On CentOS Stream 9 Linux system while trying to perform package installations. For RHEL, this usually is an indication that your system is not registered with Red Hat’s subscription management service.

$ sudo dnf clean all
Updating Subscription Management repositories.
Unable to read consumer identity

This system is not registered with an entitlement server. You can use "rhc" or "subscription-manager" to register.

21 files removed

Here is how we solved the issue on the system. Open the following file for editing:

sudo vi /etc/dnf/plugins/subscription-manager.conf

Change from enabled=1 to enabled=0:

[main]
enabled=0

# When following option is set to 1, then all repositories defined outside redhat.repo will be disabled
# every time subscription-manager plugin is triggered by dnf or yum
disable_system_repos=0

You can then update package cache and try install your packages.

For RHEL system, run the following command to register your system with the Red Hat Subscription Manager:

sudo subscription-manager register --username <your_username> --password <your_password>

Remember to replace use correct username and password for your Red Hat account. After successful registration, attach a subscription to the system:

sudo subscription-manager attach --auto

Check if subscription was successful and list of repositories the system has access to:

sudo subscription-manager status

To enable a specific repository, run:

sudo subscription-manager repos --enable=<repository_name>

Listing of available repositories can be done using:

sudo subscription-manager repos --list

Enjoy using your CentOS Stream or Red Hat Enterprise Linux system!.