Web Dynpro application needs to never expire.

Hi
I have a Web Dynpro application (NW2004 SP12) that displays spreadsheet like sales data to anyone who walks past the screen in a common area in the office/s. It should therefore run unattended. It refreshes the data on a timer. The data comes from a back-end aRFC. Everything works fine but about every 1.5 days the application times out (session expires) and needs to be re-opened (this seems to be a large administrative problem to re-login at all the deployment sites).
It gives an error 500application has expired. Please restart with the refresh button
In testing/troubleshooting I used the direct URL to the application running on WAS and not through a Portal iView.
I also changed the System destination from using SSO to using a dedicated user to the back-end.
Does anyone have an idea on how to auto refresh a Web Dynpro application or auto-renew the session so that it can run forever or a way to re-login automatically?
Thanks in advance,
Rick Viljoen

Hi Isidro
Yes, this was my final solution. Here is the code for the htm page. It will refresh/reload every 6 hours. Hope it helps.
Regards,
Rickus
<html>
<head></head>
<body>
<div id = div1></div>
<script type="text/javascript">
function putIF(hldr,x,y,w,h,url) {
   // Iframe
   holder=document.getElementById(hldr);
   holder.style.position ='absolute';
   holder.style.left=x;
   holder.style.top=y;
   holder.style.width=w;
   IF=document.createElement("iframe");
   IF.setAttribute("height", h);
   IF.setAttribute("width", w);
   IF.setAttribute("src", url);
   if (holder.hasChildNodes()) {
          var oChild=holder.children(0);
          holder.removeChild(oChild);
   holder.appendChild(IF);
   var myDate=new Date();
   window.status="Last reload on: " + myDate;
function refreshiframe() {
     myWidth = document.body.offsetWidth-21;
     myHeight = document.body.offsetHeight-4;
     putIF("div1","0px","0px",myWidth,myHeight,"http://<server>:<port>/webdynpro/dispatcher/local/SalesD/SalesD?j_user=xxx&j_password=ppp");
     window.setTimeout(refreshiframe, 21600000);
refreshiframe();
</script>
</body></html>

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The Sap-Notes 962319:
1. Check in the Visual Administrator, "Licensing Adapter" -> "General" -> "SystemType" !
If it is set to "DEVELOPMENT_MODE", verbose error messages are shown.
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Amol,
as this questions existed twice, I've deleted one.
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1. check ur server configuration windw> preference->j2ee-engine.
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vmath

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Hi,
Check this link and below settings
DefaultExpirationTime
=================
http://help.sap.com/saphelp_nw04s/helpdata/en/43/8a1a8ece230c8ce10000000a11466f/content.htm
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Nivas209
Edited by: Nivas209 on Feb 8, 2012 12:50 PM
Edited by: Nivas209 on Feb 8, 2012 12:51 PM
Edited by: Nivas209 on Feb 8, 2012 1:03 PM
Edited by: Nivas209 on Feb 8, 2012 1:06 PM

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Solution:
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HI ,
Set the application time out property to a value as per requirement.
Please follow below links for more details it may be help ful.
webdynpro application has expired
http://help.sap.com/saphelp_nw04s/helpdata/en/2a/7a754297fdd142e10000000a1550b0/content.htm
If application time out is set correctly check for the disk space available in server or log file space (basis person will do this).
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The expiry happens if there is significant time difference between where a logon ticket was created and where you are accessing. Equally time synchronisation should be on across the entire network.
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Web Dynpro application needs to never expire.

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