Apple previews stricter TLS security in iOS 27, macOS 27
Apple issues a support document warning of stricter network security requirements in upcoming iOS 27, macOS 27, and other OS versions that could block connections to non-compliant servers. IT administrators must audit and update server TLS configurations before fall releases to avoid disruptions.

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.
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