很多Oracle用戶都知道，Oracle的監聽器一直存在著一個安全隱患，假如對此不設置安全措施，那麼能夠訪問的用戶就可以遠程關閉監聽器。
相關示例如下：
D:>lsnrctl stop eygle LSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 28-11月-2007 10:02:40 Copyright (c) 1991, 2006, Oracle. All rights reserved. 正在連接到 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=eygle)))
命令執行成功
大家可以發現，此時缺省的監聽器的日志還無法記錄操作地址：
No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.33.11)(PORT=1521))) 28-NOV-2007 09:59:20 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=Administrator))(COMMAND=stop) (ARGUMENTS=64)(SERVICE=eygle)(VERSION=169870080)) * stop * 0
有鑒於此，為了更好的保證監聽器的安全，大家最好為監聽設置密碼：
[oracle@jumper log]$ lsnrctl LSNRCTL for Linux: Version 9.2.0.4.0 - Production on 28-NOV-2007 10:18:17 Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved. Welcome to LSNRCTL, type "help" for information. LSNRCTL> set current_listener listener Current Listener is listener LSNRCTL> change_password Old password: New password: Reenter new password: Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521))) Password changed for listener The command completed successfully LSNRCTL> set password Password: The command completed successfully LSNRCTL> save_config Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521))) Saved LISTENER configuration parameters. Listener Parameter File /opt/oracle/product/9.2.0/network/admin/listener.ora Old Parameter File /opt/oracle/product/9.2.0/network/admin/listener.bak The command completed successfully
在我們設置密碼後，遠程操作將會因缺失密碼而出現失敗：
D:>lsnrctl stop eygle LSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 28-11月-2007 10:22:57 Copyright (c) 1991, 2006, Oracle. All rights reserved. 正在連接到 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11) (PORT=1521))(CONNECT_DATA=(SERVICE_NAME=eygle)))
TNS-01169: 監聽程序尚未識別口令
注意：此時在服務器端或客戶端，都需要我們通過密碼來起停監聽器：
LSNRCTL> set password Password: The command completed successfully LSNRCTL> stop Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521))) The command completed successfully LSNRCTL> start Starting /opt/oracle/product/9.2.0/bin/tnslsnr: please wait... TNSLSNR for Linux: Version 9.2.0.4.0 - Production System parameter file is /opt/oracle/product/9.2.0/network/admin/listener.ora Log messages written to /opt/oracle/product/9.2.0/network/log/listener.log Trace information written to /opt/oracle/product/9.2.0/network/trace/listener.trc Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.33.11)(PORT=1521))) Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 9.2.0.4.0 - Production Start Date 28-NOV-2007 10:22:23 Uptime 0 days 0 hr. 0 min. 0 sec Trace Level support Security ON SNMP OFF Listener Parameter File /opt/oracle/product/9.2.0/network/admin/listener.ora Listener Log File /opt/oracle/product/9.2.0/network/log/listener.log Listener Trace File /opt/oracle/product/9.2.0/network/trace/listener.trc Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.33.11)(PORT=1521))) Services Summary... Service "eygle" has 1 instance(s). Instance "eygle", status UNKNOWN, has 1 handler(s) for this service... Service "julia" has 1 instance(s). Instance "eygle", status UNKNOWN, has 1 handler(s) for this service... The command completed successfully
另外，ADMIN_RESTRICTIONS參數也是一個重要的安全選項，大家可以在 listener.ora 文件中設置 ADMIN_RESTRICTIONS_ 為 ON，此後所有在運行時對監聽器的修改都將會被阻止，所有對監聽器的修改都必須通過手工修改listener.ora文件才能順利完成。
