So, why was sqlplus allowed through the firewall, but not rman? They're both connecting to the listener on the same port, right? ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Li Li Thank you all very who have taken your time to reply my question! It turned out that it is a firewall problem between my test box (in a lab) and my production. Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.