entironment: os widows 2003 enterprise jdk j2sdk1.4.2_06 as jboss 4.0.1sp1 jboss 4.0.2 Jboss 4.0.4RC1

When i use the Jboss 4.0.1sp1 and Jboss 4.0.4RC1 cluster,the system could delpoy the ejb,but when i remove the ejb into Jboss4.0.2+,it always failed in find the ejb ,the error is :
Deploying the Ejb is completed,but visiting a Ejb is always faild:
Ejb not bound


error

javax.servlet.ServletException: ejb not bound
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:848)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
org.apache.jsp.test_jsp._jspService(org.apache.jsp.test_jsp:63)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)


question : is jboss 4.0.2+ bug?