Freeradius and check connection to DB

Hello, we have: - test-machine with Ubuntu 14.04 and Freeradius-server v2.1.12 - Informix Database Server v 10.00 - freeradius connected to DB through iODBC driver When restarted Informix on server, freeradius still holds the connections (old connections) to database. And for all access-request packets in debug mode i see: Error: sql_create_socket: SQLAllocStmt failed: [Informix][Informix ODBC Driver]Connection not open. Error: [main_sql] Couldn't update SQL accounting ALIVE record - [Informix][Informix ODBC Driver]Connection not open. Freeradius has functional for restart his connections when database restarted? How i can catch this problems? Only in debug log?