{"id":1009,"date":"2009-01-05T03:57:57","date_gmt":"2009-01-05T07:57:57","guid":{"rendered":"http:\/\/onlineappsdba.com\/index.php\/2009\/01\/05\/listener-security-important-tips\/"},"modified":"2009-01-05T04:02:23","modified_gmt":"2009-01-05T08:02:23","slug":"listener-security-important-tips","status":"publish","type":"post","link":"https:\/\/onlineappsdba.com\/index.php\/2009\/01\/05\/listener-security-important-tips\/","title":{"rendered":"Listener Security &#8211; Important Tips"},"content":{"rendered":"<ul>\n<li><strong><font face=\"Calibri\">Turn on Logging<\/font><\/strong><\/li>\n<\/ul>\n<p><font face=\"Calibri\">In order to know, which listener commands were executing, one should enable the logging by the following:<\/font><\/p>\n<blockquote><p><font face=\"Calibri\">LSNRCTL&gt; set log_directory \u00a0\u2026\/log <\/font><\/p>\n<p><font face=\"Calibri\">LSNRCTL&gt; set log_file Listener_&lt;sid name&gt;.log <\/font><\/p>\n<p><font face=\"Calibri\">LSNRCTL&gt; set log_status on <\/font><font face=\"Calibri\">LSNRCTL&gt; save_config<\/font><\/p><\/blockquote>\n<ul>\n<li><strong><font face=\"Calibri\">Set the Listener Password<\/font><\/strong><\/li>\n<\/ul>\n<p><font face=\"Calibri\">Setting Listener Password is strongly recommended in order to prevent the distinct attacks. There are two ways to do the same. <\/font><font face=\"Calibri\">Either by setting PASSWORDS_listenername parameter in listener.ora file (Password will be in a Clear Text \u2013 Not Recommended)<\/font><font face=\"Calibri\">Or <\/font><font face=\"Calibri\">By using lsnrctl set password command (Highly Recommended).<\/font><\/p>\n<ul>\n<li><strong><font face=\"Calibri\">Remove\u00a0<\/font><\/strong><strong><font face=\"Calibri\">\u00a0<\/font><\/strong><strong><font face=\"Calibri\">Unused Services<\/font><\/strong><\/li>\n<\/ul>\n<p><font face=\"Calibri\">Since listener.ora files are usually copied between # of instances, they may contain old and redundant entries. Remove any services not currently being used.<\/font><\/p>\n<ul>\n<li><strong><font face=\"Calibri\">Set ADMIN_RESTRICTIONS in Listener.ora<\/font><\/strong><\/li>\n<\/ul>\n<p><font face=\"Calibri\">Setting this parameter in Listener.ora file to ON will prevent any runtime modification. One can not execute any SET command either Locally or Remotely.<\/font><\/p>\n<ul>\n<li><strong><font face=\"Calibri\">Set Valid Node Checking<\/font><\/strong><\/li>\n<\/ul>\n<p><font face=\"Calibri\">It is no doubt one of the powerful tools to restrict the Traffic from Listener. It can be achieved by the following:<\/font><font face=\"Calibri\">tcp.validnode_checking = yes (to enable Valid Nodes Checking)<\/font><font face=\"Calibri\">tcp.invited_nodes = (Nodes where Access Allowed)<\/font><font face=\"Calibri\">tcp.excluded_nodes= (Nodes Where Access Restricted)<\/font><font face=\"Calibri\">Either Use Invited_Nodes or Excluded_Nodes but Do Never Use the Both.<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Turn on Logging In order to know, which listener commands were executing, one should enable the logging by the following: [&hellip;]<\/p>\n","protected":false},"author":115,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[424,35,37],"tags":[],"class_list":["post-1009","post","type-post","status-publish","format-standard","hentry","category-database","category-r12","category-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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