On Symbian emulator the sample Qt examples of network (or webkit) are not able to connect to internet when the connection has to be made via proxy server. To check set the proxy server settings in the emulator (Emulator's Tools->Preference->Network) , then restart the emulator. Now try any sample Qt example which uses network, it'll give WSOCK 10061 error and connection will fail. Note that any Symbian application will be able to connect with the proxy settings from the emulator. Also QDesktopServices::Openurl() will succeed as it essentially launches Symbian browser.
To reproduce the bug, please ensure that any connection has to go through the proxy server while connecting to internet.