I followed this entire thread (26/Sep to 3/Oct) on the gmane archive
and noticed the OP mention that this is a "trial" server. Perhaps the
OS can be thrashed and the OP can start a fresh installation. (You
may want to keep a back up image of the OS for analysis offline)
If this is the case, then I would strongly suggest to OP to do a fresh
install of CentOS 6.3 (the latest incarnate of CentOS 6) rather than
fighting this problem on CentOS 6.0. Time is of essence and there
comes a point when a fresh install is a faster solution. Don't forget
to back up your data though.
AFAIK, very few actually put CentOS 6.0 into production (see CentOS
General mailing list archive). CentOS 6 gained traction when 6.1
release came out.
-- Arun Khan