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There's a good chance that the ePO server cannot contact the SQL server. Check the epoapsrv.log and orion.log on the ePO server, and see if there are any errors.
Connection to DB have been already tested and it works fine
How are you checking the DB connectivity?
Rather than using \core\config, I will suggest to test with UDL.
For instructions, please refer to KB#:KB70929.