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Up to now we had a mixture of different methods to detect whether network is connected, accessible or both. Even if they implied a different meaning, they were all doing the same and internally referred to almost the same code. Almost, since our implementation of CNetworkUtils::hasConnectedInterface refers to code from Qt 4.4. However, all of them returned a boolean status whether a network interface is generally up or not. Instead of maintaining our own version, use Qt functions. refs #869