{"id":2942,"date":"2019-04-07T17:26:29","date_gmt":"2019-04-07T17:26:29","guid":{"rendered":"https:\/\/iserversupport.com\/?p=2942"},"modified":"2025-11-13T22:42:39","modified_gmt":"2025-11-13T22:42:39","slug":"how-to-install-lets-encrypt-ssl-on-nginx-running-python-django-flask","status":"publish","type":"post","link":"https:\/\/iserversupport.com\/blog\/how-to-install-lets-encrypt-ssl-on-nginx-running-python-django-flask\/","title":{"rendered":"How to install Let&#8217;s Encrypt ssl on nginx running Python Django Flask"},"content":{"rendered":"<p class=\"p4\">Running Python frameworks such as <a href=\"chatgpt:\/\/generic-entity?number=0\"><span class=\"s3\">Django<\/span><\/a> or <a href=\"chatgpt:\/\/generic-entity?number=1\"><span class=\"s3\">Flask<\/span><\/a> behind <a href=\"chatgpt:\/\/generic-entity?number=2\"><span class=\"s3\">Nginx<\/span><\/a> demands more than a basic configuration. Users expect HTTPS, browsers enforce TLS 1.2+, and search engines reward those who serve secure traffic. Free certificates from <a href=\"chatgpt:\/\/generic-entity?number=3\"><span class=\"s3\">Let\u2019s Encrypt<\/span><\/a> make this achievable. If you\u2019d prefer a fully managed environment including Nginx tuning and SSL monitoring, check out our <a href=\"https:\/\/iserversupport.com\/linux-server-management\/\"><span class=\"s4\"><b>Linux Server Management<\/b><\/span><\/a>\u00a0service.<\/p>\n<hr \/>\n<h2><b>Before You Begin \u2013 Requirements<\/b><\/h2>\n<ul>\n<li>\n<p class=\"p1\">A registered domain pointing via A + www records to your server<\/p>\n<\/li>\n<li>\n<p class=\"p1\"><span class=\"s1\">An Nginx server block in <\/span>\/etc\/nginx\/sites-available\/your-domain.conf<\/p>\n<\/li>\n<li>\n<p class=\"p1\">A working Python application using Django or Flask<\/p>\n<\/li>\n<li>\n<p class=\"p1\">SSH root or sudo access<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Ensured ports 80\/443 open on your firewall<\/p>\n<\/li>\n<\/ul>\n<p class=\"p4\">If you have a high-traffic application and want performance tuning included, see our <a href=\"https:\/\/iserversupport.com\/server-optimization-service\/\"><span class=\"s4\"><b>Server Optimization Service<\/b><\/span><\/a>.<\/p>\n<hr \/>\n<h2><b>Step 1: Install Certbot for Let\u2019s Encrypt<\/b><\/h2>\n<p class=\"p4\">Update your repositories:<\/p>\n<pre><code>sudo apt-get update<\/code><\/pre>\n<p class=\"p1\">Install Certbot and the Nginx plugin (modern method):<\/p>\n<pre><code>sudo apt-get install -y certbot python3-certbot-nginx<\/code><\/pre>\n<p class=\"p1\">Clone method (not recommended for 2025):<\/p>\n<pre><code>sudo git clone https:\/\/github.com\/certbot\/certbot \/opt\/letsencrypt<\/code><\/pre>\n<hr \/>\n<h2><b>Step 2: Confirm Nginx Configuration<\/b><\/h2>\n<p class=\"p3\">Open your server block and verify:<\/p>\n<pre><code>sudo nano \/etc\/nginx\/sites-available\/iserversupport.com<\/code><\/pre>\n<p class=\"p1\">Check the <span class=\"s1\">server_name<\/span> directive:<\/p>\n<pre><code>server_name iserversupport.com www.iserversupport.com;<\/code><\/pre>\n<p class=\"p1\">Validate Nginx and reload:<\/p>\n<pre><code>sudo nginx -t \r\nsudo systemctl reload nginx<\/code><\/pre>\n<p class=\"p1\">\ud83d\udccc <i>Insert screenshot your Nginx server block here.<\/i><\/p>\n<hr \/>\n<h2><b>Step 3: Obtain the SSL Certificate<\/b><\/h2>\n<p class=\"p1\">Run:<\/p>\n<pre><code>sudo certbot --nginx -d iserversupport.com -d www.iserversupport.com<\/code><\/pre>\n<p class=\"p1\">If IPv6 records exist and fail, remove AAAA records temporarily.<\/p>\n<p class=\"p1\">The interactive plugin will configure Nginx and reload automatically.<\/p>\n<p class=\"p1\">\ud83d\udccc <i>Insert screenshot success message here.<\/i><\/p>\n<hr \/>\n<h2><b>Step 4: Configure Django \/ Flask for HTTPS<\/b><\/h2>\n<h3><b>Django:<\/b><\/h3>\n<p class=\"p4\"><span class=\"s2\">In <\/span>settings.py<span class=\"s2\">:<\/span><\/p>\n<pre><code>SECURE_SSL_REDIRECT = True\r\nSESSION_COOKIE_SECURE = True\r\nCSRF_COOKIE_SECURE = True<\/code><\/pre>\n<h3><b>Flask:<\/b><\/h3>\n<pre><code>app.config.update({\r\n    'SESSION_COOKIE_SECURE': True,\r\n    'PREFERRED_URL_SCHEME': 'https'\r\n})<\/code><\/pre>\n<p class=\"p1\">Update your Nginx proxy block:<\/p>\n<pre><code>proxy_set_header X-Forwarded-Proto $scheme;<\/code><\/pre>\n<hr \/>\n<h2><b>Step 5: Set Up Auto-Renewal<\/b><\/h2>\n<p class=\"p3\">Let\u2019s Encrypt certificates last 90 days. The package adds a cron job:<\/p>\n<p class=\"p3\">Test renewal manually:<\/p>\n<pre><code>sudo certbot renew --dry-run<\/code><\/pre>\n<p class=\"p1\">No errors? You\u2019re good.<\/p>\n<p class=\"p1\">For monitoring, consider turning to our <a href=\"https:\/\/iserversupport.com\/server-security-service\/\"><span class=\"s1\"><b>Server Security Service<\/b><\/span><\/a>.<\/p>\n<p><img decoding=\"async\" class=\"size-medium wp-image-2943\" src=\"https:\/\/iserversupport.com\/wp-content\/uploads\/2019\/04\/Python-Lets-encrypt-300x218.png\" alt=\"Python Lets encrypt ssl\" width=\"300\" height=\"218\" srcset=\"https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Python-Lets-encrypt-200x146.png 200w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Python-Lets-encrypt-300x218.png 300w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Python-Lets-encrypt-400x291.png 400w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Python-Lets-encrypt-600x437.png 600w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Python-Lets-encrypt.png 692w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-2945 size-medium\" src=\"https:\/\/iserversupport.com\/wp-content\/uploads\/2019\/04\/Django-Lets-encrypt-300x172.png\" alt=\"Install Django flask Lets encrypt ssl\" width=\"300\" height=\"172\" srcset=\"https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Django-Lets-encrypt-200x115.png 200w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Django-Lets-encrypt-300x172.png 300w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Django-Lets-encrypt-400x229.png 400w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Django-Lets-encrypt-600x344.png 600w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2019\/04\/Django-Lets-encrypt.png 646w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<h2><b>Troubleshooting Common Problems<\/b><\/h2>\n<table>\n<thead>\n<tr>\n<th>\n<p class=\"p1\"><b>Symptom<\/b><\/p>\n<\/th>\n<th>\n<p class=\"p1\"><b>Cause<\/b><\/p>\n<\/th>\n<th>\n<p class=\"p1\"><b>Fix<\/b><\/p>\n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<p class=\"p1\">SSL fails, browser shows <i>Connection refused<\/i><\/p>\n<\/td>\n<td>\n<p class=\"p1\">Port 443 blocked<\/p>\n<\/td>\n<td>\n<p class=\"p1\">Open port in firewall<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p class=\"p1\">DNS still shows HTTP<\/p>\n<\/td>\n<td>\n<p class=\"p1\">server_name<span class=\"s1\"> mismatch<\/span><\/p>\n<\/td>\n<td>\n<p class=\"p1\">Confirm server block matches domain<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p class=\"p1\">Large app bundle fails<\/p>\n<\/td>\n<td>\n<p class=\"p1\">Python dependencies<\/p>\n<\/td>\n<td>\n<p class=\"p1\">Optimize with caching &amp; CDN<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p class=\"p1\">Renewal fails<\/p>\n<\/td>\n<td>\n<p class=\"p1\">Certbot error<\/p>\n<\/td>\n<td>\n<p class=\"p1\">Verify cron job &amp; DNS records<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<p>&nbsp;<\/p>\n<h2><b>Conclusion<\/b><\/h2>\n<p class=\"p3\">Securing Django or Flask with Let\u2019s Encrypt on Nginx is straightforward when you follow the correct steps\u2014from installing Certbot to enforcing HTTPS in your settings. While this guide covers the essentials, we can manage full-stack tuning and SSL maintenance for you through our <a href=\"https:\/\/iserversupport.com\/linux-server-management\/\"><span class=\"s2\"><b>Linux Server Management<\/b><\/span><\/a>\u00a0or <a href=\"https:\/\/iserversupport.com\/server-optimization-service\/\"><span class=\"s2\"><b>Server Optimization Service<\/b><\/span><\/a>.<\/p>\n<p class=\"p1\">\n<p>&nbsp;<\/p>\n<h3><b>\ud83d\udcf7 Image Alt Tags<\/b><\/h3>\n<ul>\n<li>\n<p class=\"p1\">nginx server block configuration for iserversupport.com<\/p>\n<\/li>\n<li>\n<p class=\"p1\">certbot letsencrypt nginx obtain certificate iserversupport.com<\/p>\n<\/li>\n<li>\n<p class=\"p1\">django settings secure ssl redirect secure cookies<\/p>\n<\/li>\n<li>\n<p class=\"p1\">flask application secure session cookie https<\/p>\n<\/li>\n<li>\n<p class=\"p1\">certbot renew dry run output ssl iserversupport.com<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<p class=\"p3\">If you want the <span class=\"s4\"><b>next blog URL<\/b><\/span>, I\u2019ll hunt down the next one and repeat.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Running Python frameworks such as Django or Flask behind Nginx demands more than a basic configuration. Users expect HTTPS, browsers enforce TLS 1.2+, and search engines reward those who serve [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21946,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Install Let\u2019s Encrypt SSL on Nginx for Django\/Flask<\/title>\n<meta name=\"description\" content=\"Learn how to install Let\u2019s Encrypt SSL on Nginx for Django or Flask apps. Free TLS certificate, Nginx config, Python settings, renewal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/iserversupport.com\/blog\/how-to-install-lets-encrypt-ssl-on-nginx-running-python-django-flask\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Install Let\u2019s Encrypt SSL on Nginx for Django\/Flask\" \/>\n<meta property=\"og:description\" content=\"Learn how to install Let\u2019s Encrypt SSL on Nginx for Django or Flask apps. 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