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，那么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 eygleLSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 28-11月-2007 10:02:40Copyright (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
有鑒于此，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]$ lsnrctlLSNRCTL for Linux: Version 9.2.0.4.0 - Production on 28-NOV-2007 10:18:17Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.Welcome to LSNRCTL, type "help" for information.LSNRCTL> set current_listener listenerCurrent Listener is listenerLSNRCTL> change_passwordOld password:New password:Reenter new password:Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)))Password changed for listenerThe command completed successfullyLSNRCTL> set passwordPassword:The command completed successfullyLSNRCTL> save_configConnecting 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.oraOld Parameter File /opt/oracle/product/9.2.0/network/admin/listener.bakThe command completed successfully
在我們設置密碼后，遠程操作將會因缺失密碼而出現失?。?/p>
D:>lsnrctl stop eygleLSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 28-11月-2007 10:22:57Copyright (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 passwordPassword:The command completed successfullyLSNRCTL> stopConnecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)))The command completed successfullyLSNRCTL> startStarting /opt/oracle/product/9.2.0/bin/tnslsnr: please wait...TNSLSNR for Linux: Version 9.2.0.4.0 - ProductionSystem parameter file is /opt/oracle/product/9.2.0/network/admin/listener.oraLog messages written to /opt/oracle/product/9.2.0/network/log/listener.logTrace information written to /opt/oracle/product/9.2.0/network/trace/listener.trcListening 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 LISTENERVersion TNSLSNR for Linux: Version 9.2.0.4.0 - ProductionStart Date 28-NOV-2007 10:22:23Uptime 0 days 0 hr. 0 min. 0 secTrace Level supportSecurity ONSNMP OFFListener Parameter File /opt/oracle/product/9.2.0/network/admin/listener.oraListener Log File /opt/oracle/product/9.2.0/network/log/listener.logListener Trace File /opt/oracle/product/9.2.0/network/trace/listener.trcListening 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，此后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。
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