BC4J is not Working with a Firewall

I have developed a BC4J application with JDeveloper 9.0.3.1 and have deployed it to Oracle 9iAS 9.0.3 on RedHat 9. The application server resides in our company DMZ and connects through a firewall to Oracle 9iDB.
I monitored the connections at the database and two of the connections (one old and one new) are used every time I access the database.
The application fails with a broken pipe after about 15 minutes (the firewall timeout). It works fine with no firewall. I believe it fails because it can not check the old connections due to the firewall blocking them.
How to I keep this from happening? How can I make the application server open a new connection every time with out checking the old connections? BC4J seems to fail when I turn off pooling or implements any of the other changes suggested by the following threads:
BC4J AM pooled sessions dropped by firewall
Removing an Application Module form the Pool in a JSP Page
Thanks,
Stephen

Hi Adrian,
Actually, the query I have post was a simplification of the real one.
The real one is the following, and there I think it is not possible to rewrite it without the group by>
SELECT T1.ItemCode , SUM(T1.OpenQty) , SUM(T2.OnHand) , SUM(T1.OpenQty)- SUM(T2.OnHand)
FROM RDR1 T1 inner JOIN OITW T2 on T1.ItemCode = T2.ItemCode
WHERE T2.WhsCode = '01'
GROUP BY T1.ItemCode
HAVING SUM(T1.OpenQty)- SUM(T2.OnHand) > 0
Anyway, thank you very much for your idea.

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