{"id":5907,"date":"2014-08-14T00:00:00","date_gmt":"2014-08-14T00:00:00","guid":{"rendered":"https:\/\/azure.microsoft.com\/blog\/new-configurable-idle-timeout-for-azure-load-balancer"},"modified":"2025-09-12T12:05:04","modified_gmt":"2025-09-12T19:05:04","slug":"new-configurable-idle-timeout-for-azure-load-balancer","status":"publish","type":"post","link":"https:\/\/azure.microsoft.com\/en-us\/blog\/new-configurable-idle-timeout-for-azure-load-balancer\/","title":{"rendered":"New: Configurable Idle Timeout for Azure Load Balancer"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">We are happy to announce that Azure Load Balancer now supports configurable TCP Idle timeout for your Cloud Services and Virtual Machines. This feature can be configured using the <a href=\"https:\/\/msdn.microsoft.com\/en-us\/library\/azure\/ee460799.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">Service Management API<\/a>, <a href=\"https:\/\/azure.microsoft.com\/en-us\/documentation\/articles\/install-configure-powershell\/\" target=\"_blank\" rel=\"noreferrer noopener\">PowerShell<\/a> or the <a href=\"https:\/\/msdn.microsoft.com\/en-us\/library\/windowsazure\/ee758711.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">service model<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"overview\">Overview<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In its default configuration, Azure Load Balancer has an \u2018idle timeout\u2019 setting of 4 minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means that if you have a period of inactivity on your tcp or http sessions for more than the timeout value, there is no guarantee to have the connection maintained between the client and your service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When the connection is closed, your client application will get an error message like \u201cThe underlying connection was closed: A connection that was expected to be kept alive was closed by the server\u201d.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A common practice to keep the connection active for a longer period is to use TCP Keep-alive (You can find .NET examples <a href=\"https:\/\/msdn.microsoft.com\/en-us\/library\/system.net.servicepoint.settcpkeepalive.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a>). Packets are sent when no activity is detected on the connection. By keeping on-going network activity, the idle timeout value is never hit and the connection is maintained for a long period.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While TCP Keep-alive works well for scenarios where battery is not a constraint, it is generally not a valid option for mobile applications. Using TCP Keep-alive from a mobile application will likely drain the device battery faster.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To support such scenarios, we have added support for a configurable idle timeout. You can now set it for a duration between 4 and 30 minutes. This setting works for inbound connections only.<\/p>\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/azure.microsoft.com\/en-us\/blog\/wp-content\/uploads\/2014\/08\/Tcp-Idle-Timeout-_thumb.webp\" alt=\"diagram\" class=\"wp-image-8698 webp-format\" data-orig-src=\"https:\/\/azure.microsoft.com\/en-us\/blog\/wp-content\/uploads\/2014\/08\/Tcp-Idle-Timeout-_thumb.webp\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"scenarios\">Scenarios<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Configure TCP timeout to an endpoint on a <a href=\"https:\/\/azure.microsoft.com\/en-us\/documentation\/articles\/virtual-machines-set-up-endpoints\/\" target=\"_blank\" rel=\"noreferrer noopener\">Virtual Machine<\/a> via PowerShell or Service Management API<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Configure TCP timeout for your Load-Balanced Endpoint Sets via PowerShell or Service Management API.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Configure TCP timeout for your Instance-Level Public IP<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Configure TCP timeout for your Web\/Worker roles via the <a href=\"https:\/\/msdn.microsoft.com\/en-us\/library\/windowsazure\/ee758711.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">service model<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"powershell-examples\">PowerShell examples<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure to Download and install the <a href=\"https:\/\/github.com\/Azure\/azure-sdk-tools\/releases\/tag\/v0.8.5-July2014\" target=\"_blank\" rel=\"noreferrer noopener\">latest Azure PowerShell<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Configure TCP timeout for your Instance-Level Public IP to 15 minutes.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSet-AzurePublicIP \u2013PublicIPName webip \u2013VM MyVM -IdleTimeoutInMinutes 15\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">IdleTimeoutInMinutes is optional. If not set, the default timeout is 4 minutes. Its value can now be set between 4 and 30 minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Set Idle Timeout when creating an Azure endpoint on a Virtual Machine<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nGet-AzureVM -ServiceName \"mySvc\" -Name \"MyVM1\" | Add-AzureEndpoint -Name \"HttpIn\" -Protocol \"tcp\" -PublicPort 80 -LocalPort 8080 -IdleTimeoutInMinutes 15| Update-AzureVM\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Retrieve your idle timeout configuration<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nPS C:\\> Get-AzureVM \u2013ServiceName \u201cMyService\u201d \u2013Name \u201cMyVM\u201d | Get-AzureEndpoint\n \nVERBOSE: 6:43:50 PM - Completed Operation: Get Deployment\n \nLBSetName : MyLoadBalancedSet\n \nLocalPort : 80\n \nName : HTTP\n \nPort : 80\n \nProtocol : tcp\n \nVip : 65.52.xxx.xxx\n \nProbePath :\n \nProbePort : 80\n \nProbeProtocol : tcp\n \nProbeIntervalInSeconds : 15\n \nProbeTimeoutInSeconds : 31\n \nEnableDirectServerReturn : False\n \nAcl : {}\n \nInternalLoadBalancerName :\n \nIdleTimeoutInMinutes : 15\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Set the TCP timeout on a load balanced endpoint set<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If endpoints are part of a load balanced endpoint set, the TCP timeout must be set on the load balanced endpoint set<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSet-AzureLoadBalancedEndpoint -ServiceName \"MyService\" -LBSetName \"LBSet1\" -Protocol tcp -LocalPort 80 -ProbeProtocolTCP -ProbePort 8080 -IdleTimeoutInMinutes 15\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"cloud-service-example\">Cloud Service example<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You can leverage the <a href=\"https:\/\/azure.microsoft.com\/blog\/2014\/08\/04\/announcing-release-of-visual-studio-2013-update-3-and-azure-sdk-2-4\/\" target=\"_blank\" rel=\"noreferrer noopener\">Azure SDK for .NET 2.4<\/a> to update your Cloud Service<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Endpoint settings for Cloud Services are made in the .csdef. So, in order to update the TCP timeout for a Cloud Services deployment, a deployment upgrade is required. An exception is if the TCP timeout is only specified for a Public IP. Public IP settings are in the .cscfg, and they can be updated through deployment update and upgrade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The .csdef changes for endpoint settings are:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n<workerrole name=\"worker-role-name\" vmsize=\"worker-role-size\" enablenativecodeexecution=\"[true|false]\">\n  <endpoints>\n    <inputendpoint name=\"input-endpoint-name\" protocol=\"[http|https|tcp|udp]\" localport=\"local-port-number\" port=\"port-number\" certificate=\"certificate-name\" loadbalancerprobe=\"load-balancer-probe-name\" idletimeoutinminutes=\"tcp-timeout\">\n  <\/inputendpoint><\/endpoints>\n<\/workerrole>The .cscfg changes for the timeout setting on Public IPs are:\n \n<networkconfiguration>\n  <virtualnetworksite name=\"VNet\">\n  <addressassignments>\n    <instanceaddress rolename=\"VMRolePersisted\">\n      <publicips>\n        <publicip name=\"public-ip-name\" idletimeoutinminutes=\"timeout-in-minutes\">\n      <\/publicip><\/publicips>\n    <\/instanceaddress>\n  <\/addressassignments>\n<\/virtualnetworksite><\/networkconfiguration>\n\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"api-example\">API example<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You can configure the TCP idle timeout using the <a href=\"https:\/\/msdn.microsoft.com\/en-us\/library\/azure\/ee460799.aspx\">service management API<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure to add the x-ms-version header&nbsp; is set to version 2014-06-01 or higher.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"update-the-configuration-of-the-specified-load-balanced-input-endpoints-on-all-virtual-machines-in-a-deployment\">Update the configuration of the specified load-balanced input endpoints on all Virtual Machines in a deployment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Request<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nPOST https:\/\/management.core.windows.net\/<subscription-id>\/services\/hostedservices\/<cloudservice-name>\/deployments\/<deployment-name <=\"\" pre=\"\"><\/deployment-name><\/cloudservice-name><\/subscription-id>\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Response<\/strong><\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n<loadbalancedendpointlist xmlns=\"\" xmlns:i=\"https:\/\/www.w3.org\/2001\/XMLSchema-instance\">\n \n<inputendpoint>\n \n<loadbalancedendpointsetname>endpoint-set-name<\/loadbalancedendpointsetname>\n \n<localport>local-port-number<\/localport>\n \n<port>external-port-number<\/port>\n \n<loadbalancerprobe>\n \n<path>path-of-probe<\/path>\n \n<port>port-assigned-to-probe<\/port>\n \n<protocol>probe-protocol<\/protocol>\n \n<intervalinseconds>interval-of-probe<\/intervalinseconds>\n \n<timeoutinseconds>timeout-for-probe<\/timeoutinseconds>\n \n<\/loadbalancerprobe>\n \n<loadbalancername>name-of-internal-loadbalancer<\/loadbalancername>\n \n<protocol>endpoint-protocol<\/protocol>\n \n<idletimeoutinminutes>15<\/idletimeoutinminutes>\n \n<enabledirectserverreturn>enable-direct-server-return<\/enabledirectserverreturn>\n \n<endpointacl>\n \n<rules>\n \n<rule>\n \n<order>priority-of-the-rule<\/order>\n \n<action>permit-rule<\/action>\n \n<remotesubnet>subnet-of-the-rule<\/remotesubnet>\n \n<description>description-of-the-rule<\/description>\n \n<\/rule>\n \n<\/rules>\n \n<\/endpointacl>\n \n<\/inputendpoint>\n \n<\/loadbalancedendpointlist>\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We are happy to announce that Azure Load Balancer now supports configurable TCP Idle timeout for your PaaS and IaaS Cloud Services.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ms_queue_id":[],"ep_exclude_from_search":false,"_classifai_error":"","_classifai_text_to_speech_error":"","_alt_title":"","footnotes":"","msx_community_cta_settings":[]},"categories":[1457],"tags":[],"audience":[3053,3056],"content-type":[],"product":[1555],"tech-community":[],"topic":[],"coauthors":[224],"class_list":["post-5907","post","type-post","status-publish","format-standard","hentry","category-networking","audience-it-decision-makers","audience-it-implementors","product-load-balancer","review-flag-1680286580-543","review-flag-1680286581-295","review-flag-2-1680286581-601","review-flag-4-1680286581-250","review-flag-6-1680286581-909","review-flag-lever-1680286579-649","review-flag-never-1680286580-606","review-flag-vm-1680286585-143"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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