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I have admin privilege on my office computer (running RHEL 6) which is connected in a network. I was trying to install development tools using the command: sudo yum groupinstall "Development Tools" but I got an error message saying:

Updating certificate-based repositories.
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.

I tried to run rhn_register, it said "It appears this system has already been registered for software updates".

What is the problem actually?

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up vote 1 down vote accepted

In order to install new updates with yum you need to register your system with RHN(Red Hat Network) which is a paid service.

Pay attention to these error lines:

There was an error communicating with RHN.
Error Class Info: Invalid System Credentials.

Since it says that your system was previously registered (depending on how your system was deployed) it might have preserved the reg file /etc/sysconfig/rhn/systemid, you can remove it and try rhn_register. You will be challenged for username and password when registering a system with RHN. If this still doesn't work than you have bigger issues related to networking.

Ref: rhn

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Thanks for helping. I ll do that. – rivu Mar 6 '13 at 18:58
When I followed your instruction and tried to register my computer on RHN afresh, it said something like all channels have been exhausted. – rivu Mar 6 '13 at 22:26
it means you are out of entitlements. you can reuse them or get pay for more. – Dejan Mar 7 '13 at 15:41
Adding to Dejan's Answer: You open a new case at [Red Hat Customer Portal][1] and post your issue there. You should get better help in your case. [1]: – Tejas May 5 '14 at 6:19

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