Web server not responding

Hi All,
I have a JSP page (a.jsp) which has a while loop, inside the while loop i pusposely sleep it for 1 minute and the while loop while run for six times. Then i have another jsp page (b.jsp) which creates 20 frames and each frame opens to the a.jsp. Then i open three IE browsers and open to b.jsp. Everything is working fine until i open my fourth IE browser, the IE icon keep spinning and there is no respond from web server. At this point of time, the web server just simply refuses to service any http request. After 5 minutes (when a.jsp exits from the while loop), my fourth IE browser get respond back from web server and i think this is because the web server has completely service the requests from the first three IE browsers and all the connection were closed. Then the web server is back to normal.
I have try the a.jsp and b.jsp on SUN ONE web server 6.0 sp6 on Solaris 7 and SUN ONE web server 6.1 on IBM AIX. Both have the same problem.
I suspect this could be something to do with the number of threads a web instance or process can have.
Would appreciate if you anyone has solution for my problew.
Below if my source code for a.jsp and b.jsp
a.jsp
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="java.io.PrintWriter"%>
<%
try
 PrintWriter ps = response.getWriter();
 int count = 0;
 while(count<5)
 ps.println(" count="+(++count));
 Thread.sleep(60000);
 ps.flush();
 ps.close();
catch(Exception ex)
 System.err.println(" exception occurred : "+ex.getMessage());
 ex.printStackTrace();
%>
b.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<FRAMESET ROWS="50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
 <FRAME SRC="SLLG_TestLG.jsp">
</FRAMESET>
</HTML>

in addition to, To simulate the problem, you need to set your window registry to allow IE to open up 20 connections (default is 2) per IE. Please follow the steps below :
1. run "regedit" to open up the registry
2. select HKEY_CURRENT_USER|Software|Microsoft|windows|CurrentVersion|Internet Settings
3. right click on the right hand panel and select New|DWORD Value
4. type "MaxConnectionsPer1_0Server" for the name
5. right click on the newly created "MaxConnectionsPer1_0Server" key and select "Modify"
6. enter 32 as hexadecimal value in the text box then click OK button to save
7. repeat step 3 to 6 with the name as "MaxConnectionsPerServer"
8. close all your IE browsers
if you do not do the above settings, you need to open up 30 browsers to simulate 60 connections to web server.
Once the a.jsp exit from the while loop, you should see the same number of requests in your iplanet access log. And, when you view source of a frame, you should see " count=1 count=2 count=3 count=4 count=5"; otherwise the request is not handled by web server.

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