Closing a Database connection but the socket remains Established

When I attempt to use the close() function on a ODBCConnection it does not always close the connection socket to the sql server. When looking at the SQL server it still has the connection as Established. Unfortunately I am unable to provide any code snippets but I am wandering if there is a separate function to close sockets or if something is holding the connection open and if so is there a way to detect the failure of the close function.

The connections themselves only close when the matlab environment is quit.