Weston, is the recent entry in http://wiki.jboss.org/wiki/Wiki.jsp?page=SetUpAOracleDatasource related to this? Still having intermittent connection problems (JBoss 4.0.4.GA - Oracle RAC), but I don't have the failover/loadbalance options set in my connection url - would this make a difference? Here is my current line: <xa-datasource-property name="URL">jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS = (PROTOCOL=TCP)(HOST=xx.xx.xx.xx)(PORT=1521))(ADDRESS = (PROTOCOL=TCP)(HOST=xx.xx.xx.xx)(PORT=1521))(LOAD_BALANCE=YES)(CONNECT_DATA =(SERVER=DEDICATED)(SERVICE_NAME = my_servicename)(FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC)(RETRIES=5)(DELAY=1))))</xa-datasource-property> About to try adding failover/loadbalance props. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990404#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...