Cannot attach subscription to my registered RHEL 6.2

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Hello,

I've successfully registered my RHEL 6.2 system (I have to use this rather old version), but can't attach it to my subscription.

When I Run Auto-Attach in the Customer Portal it tells me "Subscriptions have been auto-attached successfully", but nothing changes. In a terminal on the machine subscription-manager subscribe --auto simply returns "Status: Not Subscribed". Finally, when I try subscription-manager subscribe --pool <someID>, I get "Too many content sets for certificate Red Hat Enterprise Linux Developer Suite. A newer client may be available to address this problem. See kbase ....". The Knowledge Base article suggest to upgrade my subscription-manager, but omits to say how. I failed to upgrade it via yum, but without a subscription I don't have any repos anyway.

As subscribing seems to be a substantial and common process, am I missing something obvious?

AV

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