I have a site running in 4.07 where with access from some machines, the Login prompt on the main screen will not redirect to a logon prompt. I can't figure out anything that is common. One machine is a Mac laptop which I brought to a different network that WAS able to get the login prompt, but when moved to another network cannot! Some machines from my home can get the prompt, and some cannot. The progress bar seems to indicate a redirect is occuring by it never shows the login 'page.' Has anyone ever seen anything like this? I've spent hours pouring over code and (being a DNN newbie) have not found anything obvious. Thought it might relate to DNS and DNN aliases, but have messed around with those (aliases) with no success. There must be a pattern in the failures, but cannot find it! Have restarted IIS on the server, cleared cookies, cache, etc. with no success. Any pointers would be appreciated.