Don't you have authentication tab that you had in your windows XP in you MS Vista, then you should do some stuffs before configuring your internet ( with Ethernet authentication configuration ) specially in Campus ( for me UiO ) ...

Open Start Menu and select Control Panel.
In Control Panel click System and Maintenance.
Now click Administrative tools.
Now choose Services.
In Services window locate Wired AutoConfig,
activate it with mouse and click Properties on toolbar.
In Wired AutoConfig Properties:
set Startup type: Automatic.
Click Start to start Wired AutoConfig service.
Use OK button to close Wired AutoConfig Properties.
Now locate Extensible Authentication Protocol service
and make sure it is started and Startup type is set Automatic.

How to configure authentication service

Open Start Menu and select Control Panel
Select View network status and tasks.
Now under [Tasks] Select Manage network connections.
Now find Local Area Connection and make right mouse click on it.
From popup menu select Properties.
Select Authentication tab. NB! When you don't have this tab go back Starting Authentication service.

1. Check Enable IEEE 802.1X authentication.
2. Set authentication method to Protected EAP (PEAP).
3. Click on Settings button.

6. On Protected EAP properties.

1. Uncheck Validate server certificate

2. Uncheck Enable Fast Reconnect

3. Click Configure

Click Configure....

7. Uncheck Automatically use my Windows logon name and password (and domain if any).
Click OK.

8. Click OK.

After successful configuration You should see popup message on the right corner of screen:
Additional information required to connect to the network. Click on it.
On Enter Credentials window insert Your
Campusnet username and password.
NB! Leave the Logon domain blank.
Click OK.
After that restart Your Computer.

Thanks to the source : http://www.campusnet.ee/en/node/9