This means the software cannot talk to the server with the CDP Database installed on it.
-First check the database connection string by opening CDPCentral:
-Setup>tools>*password*>SQL Server Alias = %server name or server IP%\%SQL instance%
-SQL instance is most likely going to be \CDP but may be \SQLEXPRESS
-If that is correct and can test connection successfully , do this next
-Go into the server that CDP has its database installed
-Check to make sure the SQL Browser service is running
-If this does not fix the issue, call CDP Technical Support at 800-869-0493 option 1