Puppet users - Apr 2014 - Received certificate does not match private key.

I know this has been asked about before, I've searched it.  There seem to 
be two main responses.  Synchronize clocks or start over with generating 
certificates.  I've done both.  And puppet used to work.

I have an mini virtual cluster set up using VBox running orginally CentOS 
6.4.  I provision it with cobbler and added puppet.  Puppet was running 
great.  I then had to upgrade to 6.5.  I set up a new 
cobbler server from the old, upgraded the clients and reinstalled puppet.  
I then tried setting puppet back up from scratch and now I'm getting this 
error from the clients.  I'm using puppet and puppet-server 
RPMS 2.7.25.-2.el6.noarch.  Facter is installed.  I've tried deleting all 
files in /var/lib/puppet on client and server and regeneration certificates 
in various orders.  The clocks are synchronized two with one 
second of each other and they all run ntpd.  Still I get this error.

I give up.  I have found nothing else to do.  What am I missing please?  
Help.  Thank you.

Chris Johnson.

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