Any one can help me ? cluster

i have configured a cluster,
node a and node b in the island 1,all in the same machine,but have different server port,
when there is no sesionn,it works well,if one is down,and request is direct to another,but if i have session ,it also redirect to another node(if one down) but the session is wrong.
please help me,
here is my code in servlet
HttpSession session=request.getSession() ;
String scount=(String)session.getAttribute("counter");
int count=1;
if(scount==null)
session.setAttribute("counter","1");
else
count=Integer.parseInt(scount)+1;
session.setAttribute("counter",""+count);

Please check whether your network supports IP multicasting. The default multicast host is 230.0.0.1. Check whether you can ping the server.
Please follow the instructions in the Getting Started guide. Also you have to make your web apps distributable by adding tag in the web.xml. You can test your clustering by testing /servlet/SessionServlet supplied in the default-web-app
thanks

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Any one can help me ? cluster

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