---
title: protocolNotSupported
framework: system
role: symbol
role_heading: Type Property
path: system/errno/protocolnotsupported
---

# protocolNotSupported

Protocol not supported.

## Declaration

```swift
static var protocolNotSupported: Errno { get }
```

## Mentioned in

Adopting Swift Error Constants

## Discussion

Discussion The protocol hasn’t been configured into the system, or no implementation for it exists. The corresponding C error is EPROTONOSUPPORT.

## See Also

### Network Protocol Errors

- [protocolError](system/errno/protocolerror.md)
- [protocolFamilyNotSupported](system/errno/protocolfamilynotsupported.md)
- [protocolNotAvailable](system/errno/protocolnotavailable.md)
- [protocolWrongTypeForSocket](system/errno/protocolwrongtypeforsocket.md)