After stop following error appeared in the agent log and prevent to start the agent completely:
javax.naming.NameNotFoundException: stat-agent/stat-ejb/ProcessArchiveActivityBean!com.quest.stat.agent.ejb.session.envrefreshactivity.ProcessArchiveActivity -- service jboss.naming.context.java.global.stat-agent.stat-ejb."ProcessArchiveActivityBean!com.quest.stat.agent.ejb.session.envrefreshactivity.ProcessArchiveActivity"