The connection can be left open if the scripts throw an error of any type before closing it. Check the scripts with a custom error page 500, which logs errors in the text file, and you will see if this is the case. In any case, the ldb file is not dangerous, so you can create a script to delete them once a day or so. This is one of the shortcomings in the work of web applications with MS Access. Try switching to MSSQL if you can either in MySQL, this last can be used from .NET or classic ASP without problems with ADO or ADO.NET with the appropriate driver.
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