{"id":1377,"date":"2020-08-20T05:39:29","date_gmt":"2020-08-20T05:39:29","guid":{"rendered":"http:\/\/ubiq.co\/tech-blog\/?p=1377"},"modified":"2025-09-12T04:40:33","modified_gmt":"2025-09-12T04:40:33","slug":"fix-503-service-temporarily-unavailable-error-nginx","status":"publish","type":"post","link":"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/","title":{"rendered":"How to Fix 503 Service Temporarily Unavailable Error in NGINX"},"content":{"rendered":"<p>Sometimes you may get 503 Service Temporarily Unavailable error in NGINX due to various reasons. In this article we will look at what is 503 service temporarily unavailable error, and how to fix 503 service temporarily unavailable error in NGINX.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#What_does_503_Service_Temporarily_Unavailable_Error_in_NGINX\" >What does 503 Service Temporarily Unavailable Error in NGINX<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#How_to_Fix_503_Service_Temporarily_Unavailable_Error_in_NGINX\" >How to Fix 503 Service Temporarily Unavailable Error in NGINX<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#1_Reboot_NGINX_Server\" >1. Reboot NGINX Server<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#2_Check_for_Unexpected_Updates_Maintenance\" >2. Check for Unexpected Updates \/ Maintenance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#3_Server_Connectivity\" >3. Server Connectivity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#4_Examine_Server_Logs\" >4. Examine Server Logs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/ubiq.co\/tech-blog\/fix-503-service-temporarily-unavailable-error-nginx\/#5_Application_Bugs\" >5. Application Bugs<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_does_503_Service_Temporarily_Unavailable_Error_in_NGINX\"><\/span>What does 503 Service Temporarily Unavailable Error in NGINX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>503 Service Temporarily Unavailable Error means that NGINX is unable to handle the request as it is temporarily overloaded or facing resource constraints. It is different from 500 internal server error where the server is simply unable to process your request. In this case, the server continues to function properly but has chosen to return 503 error code.<\/p>\n<p>Bonus Read : <a href=\"http:\/\/ubiq.co\/tech-blog\/fix-500-internal-server-error-nginx\/\">How to Fix 500 Internal Server Error in NGINX<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Fix_503_Service_Temporarily_Unavailable_Error_in_NGINX\"><\/span>How to Fix 503 Service Temporarily Unavailable Error in NGINX<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here is how to fix 503 service temporarily unavailable error in NGINX.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"1_Reboot_NGINX_Server\"><\/span>1. Reboot NGINX Server<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>One of the easiest ways to fix 503 service temporarily unavailable error is to simply restart NGINX server. Many times, NGINX may get overloaded due to too many open connections and temporary files. Restarting your server will close all these open connections and delete temporary files that are causing the bottleneck. If NGINX is a reverse proxy with multiple web servers, make sure to reboot even the web servers down the chain to ensure that your website\/application is completely refreshed.<\/p>\n<p>Bonus Read : <a href=\"http:\/\/ubiq.co\/tech-blog\/fix-504-gateway-timeout-error-nginx\/\">How to Fix 504 Gatweway Timeout Error in NGINX<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"2_Check_for_Unexpected_Updates_Maintenance\"><\/span>2. Check for Unexpected Updates \/ Maintenance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Have you enabled auto-updates in your web site\/application? If so, then it might be downloading\/installing updates for one or more plugins. This is quite common in CMS based systems like WordPress and Magento. In such cases, just turn off auto-updates in your system.<\/p>\n<p>Similarly, check if you have any scheduled maintenance running in the background. In such cases also, your web server will return 503 service temporarily unavailable.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_Server_Connectivity\"><\/span>3. Server Connectivity<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NGINX may also throw 503 service temporarily unavailable error if it is unable to connect to the web server (e.g Apache) or any of the third-party APIs.<\/p>\n<p>Since today&#8217;s web architecture requires multiple web servers and third-party services, NGINX is likely to give 503 service temporarily unavailable if any of them goes down. In such cases check if all web servers and third party services are up and running.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"4_Examine_Server_Logs\"><\/span>4. Examine Server Logs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NGINX server log records the IP address, device, requested URL, response code and date time for each request. You can use any server log monitoring tool to find out which requested URL gives 503 service temporarily unavailable error. Once you have identified the problematic URLs, you can investigate further into the underlying cause.<\/p>\n<p>If your server is receiving too many requests, then you may want to <a href=\"https:\/\/ubiq.co\/tech-blog\/how-to-limit-download-speed-in-nginx\/\">limit the number of requests<\/a> processed by your NGINX server.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"5_Application_Bugs\"><\/span>5. Application Bugs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Based on previous step, once you have identified the requested URLs that return 503 service temporarily unavailable error, look for bugs in code or script that serve those URLs. Look into your version control system&#8217;s commit history for any recent modifications to the code that serves those URLs. This will help you identify and fix problems quickly.<\/p>\n<p>Sometimes, it may also be because of faulty NGINX configuration, where it is getting timed out. In such cases, it mostly gives 504 Gateway timeout error but sometimes you may get 503 error code too. So you may also want to try <a href=\"https:\/\/ubiq.co\/tech-blog\/increase-request-timeout-nginx\/\">increasing request timeout value in NGINX<\/a>.<\/p>\n<p>Hopefully, the above tips will help you fix 503 service temporarily unavailable error in NGINX. But until the error is fixed, it is good to <a href=\"https:\/\/ubiq.co\/tech-blog\/how-to-create-custom-404-page-in-nginx\/\">display custom error page<\/a> instead of the default one.<\/p>\n<p><a href=\"http:\/\/ubiq.co\/\">Ubiq<\/a>\u00a0makes it easy to visualize data in minutes, and monitor in real-time dashboards.\u00a0<a href=\"http:\/\/ubiq.co\/accounts\/register\">Try it<\/a>\u00a0Today!<\/p>\n<p>Also read:<br \/>\n<a href=\"https:\/\/ubiq.co\/tech-blog\/fix-500-internal-server-error-nginx\/\">How to Fix 500 Internal Server Error in NGINX<\/a><br \/>\n<a href=\"https:\/\/ubiq.co\/tech-blog\/fix-504-gateway-timeout-error-nginx\/\">How to Fix 504 Gateway Internal Server Error in NGINX<\/a><br \/>\n<a href=\"https:\/\/ubiq.co\/tech-blog\/block-ip-address-nginx\/\">How to Block IP Address in NGINX<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sometimes NGINX may give 503 service temporarily unavailable error if it is overloaded. Here&#8217;s how to fix 503 service temporarily unavailable error in NGINX.<\/p>\n","protected":false},"author":1,"featured_media":1383,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[9],"tags":[113],"class_list":["post-1377","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nginx","tag-503-service-unavailable"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix 503 Service Temporarily Unavailable Error in NGINX - Ubiq BI<\/title>\n<meta name=\"description\" content=\"Sometimes NGINX may give 503 service temporarily unavailable error if it is overloaded. 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