Electronic apparatus and associated network connection establishment methods include after establishing a data channel with a second device, a first device periodically updates a session key, and sends a first session key to the second device through the data channel; the first device establishes a first network channel with the second device; and when a second session key is received within first preset duration through the first network channel, and the second session key is the same as the first session key, the first device sends response information to the second device through the first network channel.