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# errSSLATSCertificateTrustViolation

The peer certificate wasn’t issued by a trusted peer.

```
var errSSLATSCertificateTrustViolation: OSStatus { get }
```

## Overview

For more information about App Transport Security (ATS) compliance, see [Preventing Insecure Network Connections](/documentation/Security/preventing-insecure-network-connections).

---

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