Hi,
do you really make it work? What is your ejb version?
I followed the tips above but I'm not able to use ejb3 over IIOP and I found that the following issue is fixed in AS 7.
https://issues.jboss.org/browse/JBAS-7782?page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel
Other useful info I found are here:
http://thetechtips.wordpress.com/2009/09/02/problems-with-ejb3-over-iiop-on-jboss/
Many thanks.