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Let's Encrypt

The difficulty of making sure your website is broken Simplifying Certificate Renewals for Millions of Domains with ACME Renewal Information (ARI) Six-Day and IP Address Certificates Available in Certbot Shorter Certificate Lifetimes and Rate Limits DNS-PERSIST-01: A New Model for DNS-based Challenge Validation On the Importance of "Hello" and "Thanks" 6-day and IP Address Certificates are Generally Available 10 Years of Let's Encrypt Certificates Decreasing Certificate Lifetimes to 45 Days New "Generation Y" Hierarchy of Root and Intermediate Certificates Ten Years of Community Support ACME Renewal Information (ARI) Published as RFC 9773 End of Life Plan for RFC 6962 Certificate Transparency Logs OCSP Service Has Reached End of Life We've Issued Our First IP Address Certificate Expiration Notification Service Has Ended Reflections on a Year of Sunlight How We Reduced the Impact of Zombie Clients Sustaining a More Secure Internet: The Power of Recurring Donations Ending TLS Client Authentication Certificate Support in 2026 How Pebble Supports ACME Client Developers Ten Years of Let's Encrypt: Announcing support from Jeff Atwood We Issued Our First Six Day Cert Encryption for Everybody Scaling Our Rate Limits to Prepare for a Billion Active Certificates Ending Support for Expiration Notification Emails Announcing Six Day and IP Address Certificate Options in 2025 Announcing Certificate Profile Selection Ending OCSP Support in 2025 Intent to End OCSP Service
Native ACME Support Comes to NGINX
2025-09-11 · via Let's Encrypt

By Josh Aas ·

NGINX and Let's Encrypt share a common vision of an open and secure web. Now, with built-in support for ACME, the world's most popular web server, reverse proxy and ingress controller for Kubernetes can simplify certificate management for everyone. From the home lab to scaled-out, mission-critical enterprise deployments.

Our ideal has always been that server software could get and renew Let’s Encrypt certificates automatically, with minimal human intervention.

Over time, more and more web servers and hosting environments have become capable of that, often via native ACME and Let’s Encrypt integrations that allow users to manage certificates without third-party tools. On August 12, the popular open source web server NGINX announced support for ACME with their official ngx_http_acme module (implemented with memory safe Rust code!).

NGINX is one of the most widely used pieces of software for operating a web server or proxy. In directly supporting ACME, NGINX joins other web servers like Traefik, Caddy and Apache httpd that can directly take advantage of certificates from Let’s Encrypt and other ACME Certificate Authorities. NGINX’s new support for ACME, together with other servers, means a significant majority of sites can now have native ACME support. Many other software environments, hosting plans, and devices also offer built-in official support for ACME.

Users have a wide range of choices to achieve integrations for their particular hosting environments. Native support in web servers is an option alongside third-party clients that can integrate with many of those same web servers. Native support typically provides more seamless integration, and it’s less work for operators since they don’t have to manage a separate ACME client. Having more tools that take care of certificates automatically helps us achieve our goal of encrypting more and more of the web, while reducing the amount of time and energy site operators have to spend.

Other project developers interested in integrating ACME more directly can read about the ACME protocol, find existing ACME library implementations and other reusable software components, and join the Client Dev conversation on our Community Forum.

We’d like to thank NGINX and their parent company, F5, for their sponsorship of Let’s Encrypt. This financial support helps us provide a trusted and reliable service to nearly 700 million websites.