A problem has been reported with DotNetNuke 4.8.4 which is problematic for SSLRedirect.  The problem occurs during the DNN login process.  This DNN 4.8.4 problem has been reported to the DNN support team, and they plan a timely release of 4.8.5, as documented in this discussion thread:

http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/118/threadid/235241/scope/posts/Default.aspx

The above discussion thread is rather lengthy, six web pages actually, however after reading this thread I think you will conclude to skip over DNN 4.8.4.