WCM can't find RMI port 50500 when web user>400 or so

[jimmiao]

when web user number > 400 or so, my website based on WSF can't be explored, and

org.springframework.remoting.rmi.RmiClientInterceptor handleRemoteConnectFailure
WARNING: Cound not connect to RMI service [rmi://localhost:50500/avm] -retrying‍‍

will be in my virtual-tomcat's log. After decreasing web user, virtual-tomcat can connect to RMI service again.

I'm not getting any more errors in any tomcat logs.

Web server:
Apache(2.2.4)
Tomcat(virtual-tomcat in WCM-2.1)
Jboss (4.0.5GA  Alfresco-2.1)

I need modify any configuration?


Any help would be appreciated.

[jimmiao]

In other word, the simultaneous access of the website by multiple users(>400). vir-server cannot find AVM?