On the client side you should see a game found.
By pressing "Go" on the client, the server will be ready and will wait for an input and then it will show the level select window.
If you can't see a game found on the client, it may be an issue with your network settings. (During development, some of us had virtualbox installed on our PC and we had disable the network adapter of Virtualbox to be able to see games on the LAN.)
Hope that will help :)