Cannot connect to server on host 'ost16.fastmag.fr': No connection could be made because the target machine actively refused it. Socket Error Code: 10061($274D)

Cannot connect to server on host 'ost16.fastmag.fr': No connection could be made because the target machine actively refused it. Socket Error Code: 10061($274D)

Run-time error:
SQLFIRST: Impossible d'effectuer cette opération sur un ensemble de données fermé at address 28761