CentOS - Sep 2007 - o.t. plesk

Hi,
    Please respond privately as this is o.t. I'm looking for individuals 
experienced in plesk management.
 I'm getting an error running plesk 8.2, it was working before an upgrade. 
Logging in to plesk individual clients are able to be backed up, but when 
atempting to back up an entire domain an error about agent-runner not being 
able to establish a connection is given, connection refused. I've restarted 
the psa service and confirmed it is running.
Thanks.
Dave.