Lan connection between two computers does not work

I have a stationary and a laptop, connected wireless. Both under 1.4.5 and 1.4.6 I have tried connecting them both by the "publish world" command and through the open for LAN button.

The Results are always the same:

When I open a world from my laptop, it appears on my stationary's list of available LAN worlds, correct IP and 5 digit code an all. When I try to connect, it times out without succeeding.

When I open a world from my stationary, it does not appear on my laptop's list of available worlds.

I have tried searching for this subject but have found no solution.