Just set up a new IMAC on our network. Our proxy server is on a windows server. I have created three accounts, an administrator account, a standard accounts, and a managed account with parental controls. On all three accounts, I have entered the proxy information. The administrator account and the standard can pass through our proxy server with no issues. The managed account with parental controls, however, isn't even prompting for username/password. This account is set up for student use and simply needs access to garage band and safari, so I have only allowed access to those two applications. And ideas?