Server Failover mechanism not working

server failover environment set up as per guidelines mentioned in apache docs :

https://commons.apache.org/proper/commons-jcs/RemoteAuxCache.html

It works well when both servers started, it fetches data from jcs and display cache hits on admin console. but when primary server fails to start then secondary server not  picking hits from jcs

I have attached 4 files

1. primary_server cache.cff
2. secondary_server.cff
3. client cache.cff
4. failure_stack.txt