Can't retrieve QNetworkinterface using interfaceFromName method

Hey,

I'm want to retrieve a interface by name. Using this code, I'm 100% sure that the interface exists, I used QNetworkInterface::allInterfaces() to check all the available interfaces. Still It can't find the right interface with the interfaceFromName method.
Any body an idea how to solve this ?
I'm running Qt 4.6 on Mac OS X.

Code:

---

try 
		{
			iterface = QNetworkInterface::interfaceFromName("en0");
		}
		catch(exception) 
		{
			return false;
		}
 
		if(!iterface.isValid())
			return false;

---