Q. After re-installing my HP server system, RHN is not working. How do I re-register my system with Red Hat Network (RHN) again?
A. This is known issue and it can be easily fix after reinstalling system. All you have to do is login to RHN web management online.
a) Look for Systems tab in
b) Select the name of the old system in the System List.
c) Now delete it by clicking on the delete system link
d) Confirm the removal
e) Login to your system and delete /etc/sysconfig/rhn/systemid file using rm command, enter:
# rm /etc/sysconfig/rhn/systemid
f) Now register box with the update agent using rhn_register, enter:
rhn_register is a client program that registers your system with Red Hat Network (or a Red Hat Network Satellite). After registering, your system can recieve software updates, install new software, and remotely manage your system. It can run both in graphical and text modes.