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Application & OT Security · Intermediate

App Transport Security (ATS)

An iOS and macOS feature that requires apps to use HTTPS with strong TLS settings by default.

Definition

ATS blocks cleartext HTTP and weak TLS connections unless the app declares exceptions in Info.plist. Apple requires justification for broad exceptions such as NSAllowsArbitraryLoads during App Store review.

Example

An app's Info.plist sets NSAllowsArbitraryLoads to true, disabling ATS globally and raising a review finding.

Exam tip

Exceptions to ATS are a finding to look for in iOS app reviews.

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