Database connections in Application Server

Hi
Our application was developed using Oracle 10g Jdeveloper 10.1.2.
We are using Oracle Applicaiton Server 10.1.2 with back end as Oracle 9i.
We have experiencing problems with database connections.
We are using 13 Application Modules (As per Oracle JDev 10g One Application Module corresponds to One Db Connection) and we are using all the App Modules in one page.
Whenever we login to the applications, we access the page and so it opens 13 connections for a session. We did a regression testing for our application. We were able to get to 873 connections, then we began to get application errors and the application quit responding. From the database standpoint, there was no memory issue. We were able to check status, and move through out the database thru Oracle SQL Plus with no response issues. A strange occurrence was that once we began to get errors at that 873 connection point, the connections drop immediately from 873 to 400. We lost about half of our database connections.
We had to restart the application server to remove the database connections the server was holding. Can any one help us to figure out why the connections are dropped immediately and why we get no response error after one point

Did you check the max connections to the database (in combination with the max memory for the container?). Changing these values will change the behaviour.

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