Networking :: Logging Onto Corporate WiFi Networks

I can logon without problems to WiFi networks where I provide a passphrase/password to the Wifi-point. This is the case at home and at friends' and family.I can also logon on to public WiFi networks such as on trains, hotels, restaurants and what not. Some of these are like the situation described above, some are hotspot like.Where I run into problems is in corporate network situations. I'll have been provided with a UID and Password (which work, I verified them on my smartphone), see the WiFi signal I am to log on to and what is supposed to happen is:

After I have made the connection to the WiFi spot, my browser is to open automatically and bring me to a URL where I can enter the UID and Password after which I'll be connected. This does not happen. ORI should open my browser and attempt to access any url after which I am guided to a URL where I can enter the UID and Password

I'll see the WiFi point, make the connection, the browser does not open automatically and when I open it myself and try a URL (e.g. CNN.com), instead of requesting a UID and Password I just get the error 'server not found'...