{"id":15416,"date":"2020-12-21T17:43:01","date_gmt":"2020-12-21T16:43:01","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\/"},"modified":"2025-10-01T11:50:11","modified_gmt":"2025-10-01T09:50:11","slug":"sql-server-tcp-having-both-dynamic-ports-and-static-port-configured","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\/","title":{"rendered":"SQL Server TCP: Having both Dynamic Ports and Static Port configured"},"content":{"rendered":"<h4>Introduction<\/h4>\n<p>Have you ever seen an SQL Server instance configured to listen on both &#8220;TCP Dynamic Ports&#8221; and &#8220;TCP (static) Port&#8221;?<\/p>\n<p>This kind of configuration can be caused by the following scenario:<\/p>\n<ol>\n<li>A named instance is installed. By default, it is configured to use dynamic ports.<\/li>\n<li>Someone wants to configure the instance to listen to a fixed port and set the &#8220;TCP Port&#8221; value<\/li>\n<li>The &#8220;TCP Dynamic Ports&#8221; is set to value &#8220;0&#8221; thinking this would disable the dynamics ports<\/li>\n<\/ol>\n<p>The <a href=\"https:\/\/docs.microsoft.com\/en-us\/sql\/database-engine\/configure-windows\/configure-a-server-to-listen-on-a-specific-tcp-port?view=sql-server-ver15\">documentation<\/a> states that a value of &#8220;0&#8221; is actually enabling &#8220;TCP Dynamic Ports&#8221;.<\/p>\n<blockquote><p>If the\u00a0<strong>TCP Dynamic Ports<\/strong>\u00a0dialog box contains\u00a0<strong>0<\/strong>, indicating the Database Engine is listening on dynamic ports<\/p><\/blockquote>\n<p>After a service restart, SQL Server will listen to a port like 50119 for example.<br \/>\nYou end up with the following configuration.<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_TCPProperties.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-46241\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_TCPProperties.png\" alt=\"\" width=\"321\" height=\"69\" \/><\/a><\/p>\n<p>So what&#8217;s happening to SQL Server with this configuration?<\/p>\n<h4>What SQL Server is listening on?<\/h4>\n<p>Well, I could not find anything related to this particular case in the Microsoft documentation.<br \/>\nIf we look at the SQL Server Error Log we can see that the instance is listening on both ports: the dynamically chosen one and the static port.<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_errorlog.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-46238\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_errorlog.png\" alt=\"\" width=\"434\" height=\"87\" \/><\/a><\/p>\n<p>We can confirm this by trying a connection using SSMS:<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_SSMS.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-46239\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_SSMS.png\" alt=\"\" width=\"317\" height=\"122\" \/><\/a><\/p>\n<h4>What TCP port is used by clients connections?<\/h4>\n<p>But, are both ports actually used by client connections to the server?<br \/>\nFrom SQL we can see the established connections and their TCP port using this query:<\/p>\n<div>\n<div id=\"highlighter_616230\" class=\"syntaxhighlighter  sql\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"gutter\">\n<div class=\"line number1 index0 alt2\">1<\/div>\n<div class=\"line number2 index1 alt1\">2<\/div>\n<div class=\"line number3 index2 alt2\">3<\/div>\n<\/td>\n<td class=\"code\">\n<div class=\"container\">\n<div class=\"line number1 index0 alt2\"><code class=\"sql keyword\">select<\/code> <code class=\"sql keyword\">distinct<\/code> <code class=\"sql plain\">local_tcp_port<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"sql keyword\">from<\/code> <code class=\"sql plain\">sys.dm_exec_connections<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"sql keyword\">where<\/code> <code class=\"sql plain\">net_transport = <\/code><code class=\"sql string\">'TCP'<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>This could also be seen with netstat:<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_netstat.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-46243\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_netstat.png\" alt=\"\" width=\"500\" height=\"179\" \/><\/a><\/p>\n<p>Looking at this information I see no connection at all using the dynamically assigned port.<br \/>\nOnly the static port is used.<\/p>\n<h4>SQL Browser<\/h4>\n<p>My guess is that the SQL Server Browser is giving priority to the static Port and always return this port to clients. I didn&#8217;t find any information online about this behavior but it makes sense.<\/p>\n<p>When a client wants to connect to an instance using &#8220;server\\instancename&#8221; an exchange is done with the server using the <a href=\"https:\/\/docs.microsoft.com\/en-us\/openspecs\/windows_protocols\/ms-wpo\/c67adffd-2740-435d-bda7-dc66fb13f1b7\">SQL Server Resolution Protocol<\/a> using UDP. This is why you should enable UDP port 1434 in your Firewall if you need the SQL Browser.<br \/>\nFor details about this protocol, you can read the specifications <a href=\"https:\/\/docs.microsoft.com\/en-us\/openspecs\/windows_protocols\/mc-sqlr\/1ea6e25f-bff9-4364-ba21-5dc449a601b7\">here<\/a>.<\/p>\n<p>Doing some tests with Wireshark and a UDP filter we can see the client asking about &#8220;inst1&#8221;, my instance name.<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_wireshark_1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-46235\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_wireshark_1.png\" alt=\"\" width=\"810\" height=\"264\" \/><\/a><\/p>\n<p>The server response contains some information about the instance with the most important one, the TCP Port, here the static port: 15001.<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_wireshark_2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-46236\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_wireshark_2.png\" alt=\"\" width=\"799\" height=\"339\" \/><\/a><\/p>\n<h4>Conclusion<\/h4>\n<p>I think this configuration should be avoided because it doesn&#8217;t seem to add any benefits and could bring some confusion.<br \/>\nIf you use a static TCP port for your instance, leave the &#8220;Dynamic TCP Port&#8221; blank.<\/p>\n<p>Written by <a href=\"https:\/\/www.linkedin.com\/in\/steven-naudet-aa540158\/\">Steven Naudet<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Have you ever seen an SQL Server instance configured to listen on both &#8220;TCP Dynamic Ports&#8221; and &#8220;TCP (static) Port&#8221;? This kind of configuration can be caused by the following scenario: A named instance is installed. By default, it is configured to use dynamic ports. Someone wants to configure the instance to listen to [&hellip;]<\/p>\n","protected":false},"author":26,"featured_media":15421,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[99],"tags":[2219,1469,2550,2220],"type_dbi":[],"class_list":["post-15416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql-server","tag-port","tag-sql-browser","tag-sql-server-2","tag-tcp"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>SQL Server TCP: Having both Dynamic Ports and Static Port configured - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Server TCP: Having both Dynamic Ports and Static Port configured\" \/>\n<meta property=\"og:description\" content=\"Introduction Have you ever seen an SQL Server instance configured to listen on both &#8220;TCP Dynamic Ports&#8221; and &#8220;TCP (static) Port&#8221;? This kind of configuration can be caused by the following scenario: A named instance is installed. By default, it is configured to use dynamic ports. Someone wants to configure the instance to listen to [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2020-12-21T16:43:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-01T09:50:11+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/lab_wireshark_1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"810\" \/>\n\t<meta property=\"og:image:height\" content=\"264\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Microsoft Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Microsoft Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/\"},\"author\":{\"name\":\"Microsoft Team\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/bfab48333280d616e1170e7369df90a4\"},\"headline\":\"SQL Server TCP: Having both Dynamic Ports and Static Port configured\",\"datePublished\":\"2020-12-21T16:43:01+00:00\",\"dateModified\":\"2025-10-01T09:50:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/\"},\"wordCount\":449,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2022\\\/04\\\/lab_wireshark_1.png\",\"keywords\":[\"Port\",\"SQL Browser\",\"SQL Server\",\"TCP\"],\"articleSection\":[\"SQL Server\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/\",\"url\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/sql-server-tcp-having-both-dynamic-ports-and-static-port-configured\\\/\",\"name\":\"SQL Server TCP: Having both Dynamic Ports and Static Port configured - 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