Network error:  Timeout waiting for Executor acknowledgement.

  Explanation:  The client sent a request to the executor but  did
  not receive an acknowledgement within a specific interval.

  User Action:  Determine that  SQL/Services  is  running  on  the
  server  system  and  then  retry  the operation.  If the problem
  persists,  contact  your  Oracle  support   representative   for
  assistance.