change auditor agent no showing active

We have upgraded our change auditor from 7.04 to 7.3 and after upgrade we were not able to upgrade the client from change audiotr console. when we deploy new agent from console, page is refreshing fast and  there was no action happening on the client side so we have upgrade the agent maually . but there also few agent showing inactive even though we reinstalled and reboot the agent.  same behavior is showing in other  version 7,2.  anyone find any soultion for this?