that is "red hat enterprise linux 5.?" ?? known as RHEL 5.?
that ? is the version -- what is it ??
0,1,2,3,4,5, or 6
RHEL 5.6 is the current in the 5 series
seeing as RHEL is not free have you called your paid for tech support ???
or looked on the red hat support pages ???
for some you will need the user-name and password you set up when you bought the REQUIRED license