---
title: SSLProtocol.sslProtocolUnknown
framework: security
role: symbol
role_heading: Case
path: security/sslprotocol/sslprotocolunknown
---

# SSLProtocol.sslProtocolUnknown

Specifies that no protocol has been or should be negotiated or specified; use default.

## Declaration

```swift
case sslProtocolUnknown
```