How to connect to an Ethernet port with OSX

You need to connect to the SAE WiFi first to create a profile.
See here.

After that you plug in the cable and the system will ask (maybe) for your username and password.

Your login is in the following format : 5-AMS-50XXXX
Your password is the one you chose for the WiFi and Studentserv. It can be reset here if you have forgotten.