---
title: kNWErrorDomainPOSIX
framework: network
role: symbol
role_heading: Global Variable
path: network/knwerrordomainposix
---

# kNWErrorDomainPOSIX

A POSIX error, which is used for most network protocol and routing errors.

## Declaration

```swift
let kNWErrorDomainPOSIX: CFString
```

## See Also

### CFError Domain Constants

- [kNWErrorDomainDNS](network/knwerrordomaindns.md)
- [kNWErrorDomainTLS](network/knwerrordomaintls.md)