ODBC

I am trying to get ODBC working so I can link from MS Access to a postgresql database.  The connection isn’t working.  The ODBC driver I’m trying to use is a third party product.  Their support people are telling me that the problem is on the postgres side.  They’re telling me that that the postgres database is not listening on the right port, it’s set up to listen at 5432.  What files should I look at to make sure Postgresql is listening at the right port and IP address.  What should the lines look like.

Thanks,

Carol Walter