If you are using ASP or ColdFusion to connect to your MS Access database, you can use a DSN connection (if you have requested a DSN) or a DSNless connection.
To use a DSN, follow this format:
Set conn = Server.CreateObject("ADODB.Connection")
conn.open "DSN= databasename_domain_com
To use a DSN-less connection, follow this format:
mdbfile = "/stuff/sample.mdb"
connstr = "Driver={Microsoft Access Driver (*.mdb)};DBQ=" & Server.MapPath( mdbfile ) & ";"
When troubleshooting a connection that does not work, make sure the driver string is included on one line without breaks.