---
title: SSLProtocol.tlsProtocol1Only
framework: security
role: symbol
role_heading: Case
path: security/sslprotocol/tlsprotocol1only
---

# SSLProtocol.tlsProtocol1Only

Specifies that only the TLS 1.0 protocol may be negotiated. Deprecated in iOS.

## Declaration

```swift
case tlsProtocol1Only
```