Tomcat session timeout

Hi! We've been having a very random problem. We use Apache Tomcat and have the settings in the web.xml for a 30 minute timeout. For some reason, some of our users (including are staff) very randomly get logged out after just 4-5 minutes of inactivity.

We haven't yet tried the solution of using session.setMaxInactiveInterval in our application (from this link: http://www.experts-exchange.com/Web/Web_Servers/Apache/Q_20878998.html+tomcat+session&hl=en&ct=clnk&cd=14&gl=us) but want to know if anyone might have any other suggestions on why this might be happening?

Any help would be appreciated.

Thanks,
SP
ieteamAsked:
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rrzCommented:
>any other suggestions on why this might be happening?  
I don't know. But I did some testing with the following code.  I tried 10 sessions with 5  and they all timed out after 5 minutes exactly.
package rrz;   
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionLengthListener implements HttpSessionListener {
  public void sessionCreated(HttpSessionEvent event) {}
  public void sessionDestroyed(HttpSessionEvent event) {
                      HttpSession session = event.getSession();
                      String id = session.getId();
                      long sessionLength = (new Date().getTime() - session.getLastAccessedTime())/60000;
                      System.out.println(id + " was timed out after " + sessionLength + " minutes"); 
 
  }
}

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