It seems that NTLM single sign on is not working in 7.3 and 220.127.116.11 on Windows Server 2003 systems. Either the background loads, then IE pops up a login dialog or we get a 403 HTTP error. Reloading the URL pops up an IE login dialog. To get in, I need to cancel the IE login dialog. I'm then taken to an OpenManage log in web page. If I enter my username and password there, I am able to get into OpenManage.