If you’re getting the ‘DB connection error’ when running the INTELLECT^TM software, you should check the following aspects:

1. Run the idb.exe database update utility (from Start menu – Intellect – Utilities or from the folder <Intellect installation directory>\Tools). Execute the database update.

   The full article: The idb.exe utility for converting databases, selecting database templates and making backup copies of databases

   
   

2. If the DB update is being executed with errors, run the SQL Server Management Studio (from Start menu – Microsoft SQL Server 2014) and check the connection to DB with the same parameters that are specified in the idb.exe connection string.
   If the connection is not being established, check the correctness of credentials being used for it. If the authentication is being executed using the Windows NT integrated security, you should check that the user is given access permissions to SQL Server. To do this, go to the SQL Server under the embedded administrator account.
   You should also check the SQL Server Service is being run. You can do this in the SQL Server Configuration Manager utility (Start – Microsoft SQL Server 2014 – Configuration Tools) in the SQL Server Services section.

3. If the connection to SQL Server is being established in the SQL Server Management Studio utility, it means the Intellect configuration database has been damaged. You need to remove it, recreate and configure the connection to it in the idb.exe utility. After doing this, you need to restore the database from backup copy as far as possible.

   The full articles:   INTELLECT software database connection Restoring database from backup copy