Many networks are protected using a Novell® BorderManager or BlueCoat® ProxySG proxy, which forces you to login after a period of inactivity using a web form. This application allows iPad, iPhone, and iPod touch users to store a username and password, saving loads of time when logging in. Proxy Loginator will usually be able to automatically figure out how to talk to your network's proxy assuming you have your proxy settings entered properly. If not, you can enter the URL that BorderManager or BlueCoat expects data to be posted to (i.e. https://10.1.1.1/BM-Login/auth-cup).
***If you have trouble setting this up with your network, check out the support page at http://loginator.flynnsarcade.net/iphone.html and check with your network administrator to make sure that you have entered the settings right***