[2026 August Tips & Tricks] Reduce IT Overhead with Automated Certificate Management

Zyxel_Avani

Is Your Firewall Certificate About to Expire?

Most IT administrators have experienced it:

• A firewall certificate expires unexpectedly
• Users begin receiving browser security warnings
• Remote administrators lose confidence in the connection
• Emergency maintenance is required to restore trusted access

SSL certificates are essential for securing firewall management interfaces, VPNs, and other web-based services. Yet traditional certificate management remains surprisingly manual:

1. Purchase or obtain a certificate
2. Generate CSR files
3. Complete domain validation
4. Import certificates manually
5. Track expiration dates
6. Repeat the entire process every few months or every year

The process is tedious, easy to forget, and often becomes one more item on an already overloaded IT team's checklist.

With uOS 1.39, the USG FLEX H Series introduces Automated Certificate Management with Let's Encrypt, making certificate deployment and renewal virtually effortless.

🔍What Is Let's Encrypt?

Let's Encrypt is the world's largest certificate authority (CA), trusted by all major web browsers and operating systems.

It provides:

• Trusted SSL/TLS certificates
• Automatic certificate issuance
• Automatic certificate renewal
• No certificate purchase required
• Industry-standard security

Millions of websites, cloud services, and enterprise applications already rely on Let's Encrypt to secure encrypted communications.

🔍What Is ACME?

ACME (Automated Certificate Management Environment) is the industry-standard protocol used to automate certificate lifecycle management.

Instead of manually generating, downloading, and importing certificates, the firewall communicates directly with Let's Encrypt to:

• Request certificates automatically
• Verify domain ownership
• Install certificates
• Renew certificates before expiration

No manual intervention required.

⚙️What's New in USG FLEX H Series?

Starting with uOS 1.39, USG FLEX H Series firewalls can integrate directly with Let's Encrypt using ACME, enabling automated provisioning and renewal of trusted SSL certificates.

Once configured, the firewall handles certificate management in the background.

Before

Administrator responsibilities:

• Monitor expiration dates
• Generate CSRs
• Download certificates
• Import certificates manually
• Schedule renewal maintenance windows

After

USG FLEX H automatically:

• Obtains certificates
• Deploys certificates
• Renews certificates
• Prevents certificate expiration

The result is a simpler, safer, and more reliable firewall management experience.

💡Key Benefits

1. Eliminate Certificate Expiration Risks

Expired certificates are one of the most common causes of unexpected administrative access issues.

Automatic renewal ensures your firewall always maintains a valid, trusted certificate.

No more calendar reminders.

No more last-minute renewals.

2. Improve Security and User Trust

Self-signed certificates trigger browser warnings that can confuse administrators and users.

A Let's Encrypt certificate is publicly trusted by modern browsers and operating systems, providing:

• Trusted HTTPS connections
• Reduced security warnings
• Improved administrator confidence
• Better security posture

3. Reduce IT Operational Overhead

Manual certificate management consumes valuable IT resources.

For organizations managing multiple locations or dozens of firewalls, certificate maintenance can become a recurring administrative burden.

Automated certificate lifecycle management helps teams:

• Save time
• Reduce human error
• Standardize security deployment
• Focus on higher-value tasks

4. Ideal for MSPs and Multi-Site Deployments

Managed Service Providers often oversee certificate renewals across numerous customer environments.

With automated certificate management:

• Less manual maintenance
• Fewer support tickets
• Reduced risk of service interruptions
• Improved operational efficiency

The larger the deployment, the greater the benefit.

📝Typical Use Cases

Secure Firewall Administration

Protect Local GUI access with a trusted HTTPS certificate and eliminate browser warning messages.

Captive Portal

Provide a more professional and trusted user experience for captive portal users by eliminating browser security warnings.

Branch Office Deployments

Maintain secure administrative access across distributed sites without requiring on-site certificate maintenance.

MSP Managed Networks

Standardize certificate management across multiple customers and locations.

🔔Available in uOS1.39

Automated Certificate Management with Let's Encrypt is available on supported USG FLEX H Series firewalls running uOS 1.39. The feature integrates Let's Encrypt with the ACME protocol to automatically provision and renew trusted SSL certificates, helping organizations eliminate manual certificate management and avoid certificate-related outages. Upgrade to uOS1.39 and let your firewall manage certificates for you.

💭 We’d Love to Hear From You

How is your IT team managing SSL certificate renewals today? Share your insights, challenges, or success stories with us as we help organizations move toward simpler, more automated network security.