If the Windows systems use Active Directory to maintain login ids for use in an NT domain, then you will want to use LDAP for login. Here are some reference: LDAP login module info: http://docs.jboss.com/jbossas/guides/j2eeguide/r2/en/html_single/#ch8.lda... LDAP with Portal: http://wiki.jboss.org/wiki/Wiki.jsp?page=UsingAnLDAPSourceForPortalAuthen... And a discussion on LDAP and portals: http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4051256 By the way, if you search the JBoss Portal forum for the term "LDAP" you will find several discussions. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4054799#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...