Upon clicking "Log on to Studio" in Excel, I'm presented with the following error:

No concatenation/shortening/extension of my site's URL has worked. There is a related Knowledge Base article here, but I, along with many others, cannot edit Windows Registry entries in an enterprise setting.
Is there another way to get this working?
Yes, we have a valid, signed certificate for our site.
------------------------------
Alexander Hutchinson
Senior Analyst
Raytheon Co
CHESAPEAKE MA
------------------------------