Apple previews stricter TLS security in iOS 27, macOS 27

Apple publishes a new support document titled “Prepare your network environment for stricter security requirements,” warning IT administrators of upcoming network security changes in iOS 27, macOS 27, and more.

Starting as early as the next major software release, Apple operating systems—including iOS, iPadOS, macOS, watchOS, tvOS, and visionOS—might refuse connections to servers with outdated or non-compliant TLS configurations due to additional network security requirements for system processes.

The document urges administrators to audit their environments for non-compliant servers and update configurations, noting that changes might require significant time, especially for servers maintained by external vendors. It provides instructions on testing for potential connection errors ahead of this fall’s expected releases.

Apple targets the guidance at IT administrators and device management service developers. The company plans to reveal iOS 27, iPadOS 27, macOS 27, and others at WWDC 2026 on June 8.