"ersuarez" wrote : | <connection-url> | jdbc:oracle:thin:@(description=(address_list=(load_balance=off)(failover=off) | (address=(protocol=tcp)(host=nodo1)(port=1521)) | (address=(protocol=tcp)(host=nodo2)(port=1521))) | (connect_data=(server=dedicated)(service_name=SID_RAC) | )) | </connection-url> | Looks to me the host name as nodo1/nodo2 are not resolved, you can ping these names. Also you can write the simple java standalone program to verify if that gets connected to the oracle RAC. http://wiki.jboss.org/wiki/SetUpAOracleDatasource View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4175651#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...