A mobile device can be used as an intermediary to allow a client device to obtain licensing authentication. The mobile device can connect to the client device whenever the mobile device is within a proximity threshold to the client device. The mobile device can also control when a licensing message window is opened. When the mobile device is connected to the client device, and the licensing message window is open, the mobile device can act as an intermediary between the client device and the authentication server. Messages from the authentication/licensing server can be queued in the mobile device, and messages to the mobile device can be queued in the client device for later delivery if there is no communication or if the licensing message window is closed.