Losing Connections

Hi.

I have an application using psql 7.3.3 and pg73b1jdbc3.jar for connections with PostgreSQL.

When an user is idle for a while (like an hour) and then try to insert or update something in the database, the user gets an error message. I don't have right now the message, but it is something with the connection with the database.

I already asked at the postgresql forum, but the say that pgsql does not drop connections. So, my question is if the jdbc driver for some reason drop the connections.

Or maybe  a firewall  is dropping the connections.

Does anybody know what could be the problem??

Thanks for any help.