If you found this post because your iSTAR access controllers suddenly went offline, you’re not alone. A common cause is the expiration of the default certificate used for TLS 1.2 communications between C•CURE 9000 and iSTAR controllers. In many cases, customers weren’t proactively warned—until doors, events, and controller communications started failing.
Systems Integrations is here to help. We have a Software House Master Certified Technician who can diagnose the issue quickly and guide the right fix to restore secure communications.
How Expired TLS 1.2 Certificates Break iSTAR Panel Connectivity
C•CURE 9000 environments that rely on the default TLS 1.2 certificate for communications to iSTAR controllers can run into a hard failure when that certificate expires. When the certificate is no longer valid, TLS handshakes can fail, and the result can look like “controllers offline,” intermittent connectivity, or a sudden loss of reliable panel communications.
This is not a “wait and see” situation. Once certificate validity is impacted, the system may stop trusting the connection—even if nothing else changed in your network.
Common symptoms you may be seeing
- iSTAR controllers showing offline in C•CURE 9000
- Door events not updating as expected
Why you may not have been warned
In many cases, a current or previous integrator simply hasn’t been involved in ongoing certificate lifecycle planning, or the expiration was an oversight on behalf of the integrator supporting the system.
How Systems Integrations can help
We support commercial access control systems across NJ, PA, and DE, and we’re used to stepping in when systems are down and time matters.
When you work with Systems Integrations, you get:
- A Software House Master Certified Technician
- Troubleshooting that considers C•CURE configuration, iSTAR behavior, certificates, and network realities
- A clean, documented path to restore secure communications and reduce repeat outages
Need help getting your iSTAR panels back online? Contact Systems Integrations and we’ll help you diagnose the certificate issue and get your system stable.
Reference
- Software House guidance on TLS 1.2 certificates (PDF): https://d9wasmgxzz8hg.cloudfront.net/wp-content/uploads/Software-House-TLS-1.2-Certificates-Sept-2025.pdf