No answer at this point.
Just today I saw the requirement of Python 2.7 for ZenOss 4.2.4 and as CentOS uses python 2.6.6 (for YUM), I am trying to figure out how to get the other version active for ZenOss as I cannot replace python with the higher version.
if anyone has help on that, it would be helpfull.
on the other hand, it might not be of use anyway, but I'm trying in the limited time I have
spoke to soon: ZenOss has it's own python , version 2.7.2, so that wasn't it