can I make a restriction in JBoss Portal that each user is allowed to login only one time at the same moment? (ie, the same user account cannot log in simutaneously from different browsers)
thank you very much.
no, this is something you have to do by yourself like maintaining a global table.
it can be integrated in the login module stack and be part of the vote that rule the login process. you should look at the JBossSX documentation (http://wiki.jboss.org/wiki/Wiki.jsp?page=CreatingACustomLoginModule)