There are some problems with Advertising Redbooks and  certificates.

Currently, Advertising Redbooks is working best through Internet Explorer and having a few difficulties in other browsers.  If you are off campus and log in using your UST username/password, you might get another request for a username/password.  There isn’t one.  But there’s a small link under the username/password that says “Use our site access page.”  If you click that in IE, you generally get in.

Sometimes it helps to just click the link, get denied, and try again.  Strangely enough, the TRY AGAIN option has been working well for us in Firefox.

Sorry for the hassle.