The wiki says athttp://wiki.jboss.org/wiki/Wiki.jsp?page=SetUpAFirebirdDatasource to use <local-tx-datasource> instead of <tx-connection-factory> and i can confirm that it works this way. I just wonder, is this a bug or a feature? tx-connection-factory seems like more advanced, but it ceased to work with the current Jboss 4.2.1 / Jaybird 2.1.1 -combination... Are there any drawbacks in using the local-tx-datasource? Or should we just forget about this issue? Regards, Marco View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4068242#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...