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# kCFStreamPropertyAllowExpensiveNetworkAccess

A Boolean value that indicates whether connections may use a network interface that the system considers expensive.

```
let kCFStreamPropertyAllowExpensiveNetworkAccess: CFString
```

## Discussion

The default value is <doc://com.apple.documentation/documentation/CoreFoundation/kCFBooleanTrue> and allows the use of expensive network interfaces. Set this property to <doc://com.apple.documentation/documentation/CoreFoundation/kCFBooleanFalse> to disallow the use of expensive network interfaces. For more information about expensive network interfaces, see <doc://com.apple.documentation/documentation/Foundation/URLSessionConfiguration/allowsExpensiveNetworkAccess>.

---

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