Product & Engineering

Alexander Pennie

January 21, 2026 4 minute read

We have exciting news to share! Duo has increased its Service Level Agreement (SLA) to 99.99% uptime for all customers! This milestone reflects the architecture advancements in our ongoing commitment to keeping your business secure and operational, no matter what. Read on to discover how this benefits you, learn more about technologies improving reliability, and get a glimpse into Duo’s infrastructure.

Reliability you can count on

In today’s fast-paced world, where every minute of downtime can cost organizations thousands (if not more), high reliability isn’t a nice-to-have—it’s a must-have.

At Duo, we understand the importance of minimizing disruptions. Whether you rely on Duo for multi-factor authentication (MFA), single sign-on (SSO), or identity and access management (IAM), we’ve got your back!

Protecting your business from ever-evolving cyber threats while ensuring seamless access to your critical systems is and always will be our top priority. System availability is a key element of maintaining high levels of security assurance.

To highlight our recent improvements in resiliency, Duo is excited to announce that we have officially increased our SLA to 99.99% uptime for every customer.

This is a critical improvement designed to meet the demands of your business.

Why does 99.99% uptime matter?

In a world where every second counts, especially when it comes to securing user identities and protecting critical systems, availability isn’t just important—it’s a necessity.

That’s why Duo’s commitment to 99.99% uptime is so significant.

Let’s break it down:

99.9% uptime allows for nearly 9 hours of downtime per year

With 99.99% uptime, that downtime is reduced to under 1 hour annually or no more than 4 minutes, 23 seconds monthly

At Duo, we believe downtime simply isn’t an option. After all, no matter how sleek an authentication flow might be, the best ability is availability.

How Duo gets it done

Achieving 99.99% uptime isn’t easy, but it’s a challenge we’ve embraced head-on with game-changing advancements in our infrastructure.

Here’s how we’re making it happen:

**Blue/Green Deployments: **We’ve adopted a blue/green deployment strategy that allows us to almost instantly revert any application, configuration, or infrastructure change to a previously known good state. The goal of this is to allow our customers to return to normal operations as soon as possible, giving you minimal disruptions and maximum reliability.

**Smaller Deployments: **To reduce the “noisy neighbor” effect, we are splitting our deployments into smaller cells, allowing for more efficient scaling.

**Zero Planned Downtime: **Forget those inconvenient maintenance windows. Our commitment to achieving zero planned downtime ensures your business stays secure and operational 24/7/365.

**Resilience by Design: **Our systems are engineered to handle heavy load spikes and failures gracefully, ensuring that no single issue can derail your operations.

Looking ahead toward zero downtime

While we’re excited to deliver 99.99% uptime as part of our SLA, we’re not stopping there. At Duo, it is our ongoing commitment to provide you with the most secure, resilient, and user-friendly, security-first identity and access management (IAM) solution on the market.

That’s why we’re designing for the future where zero downtime becomes the norm.

This goes beyond meeting SLAs. It’s about creating a resilient system that ensures your business remains secure and operational no matter what.

Duo isn’t just a tool—it’s your trusted partner in enabling secure, seamless access for your workforce every single day for years to come.

Thank you for trusting Duo to safeguard your business. We’re honored to be your partner in security and reliability, and we look forward to sharing more exciting updates soon.