I don't know exactly and don't have Lexis available, but if you right click on a frame with an article and open it in a new page and look at the URL and post that here we might be able to tell. (Or, really, with any of the more long-form URLs).
I have access to some contents from (Lexis) Nexis, but I am away on business. I can check later this week if it works for me.
You can try to access it directly on campus without a proxy. Maybe that is different. Moreover, you can try to access the database over http://www.nexis.com/api/version1/
You can try to access it directly on campus without a proxy. Maybe that is different. Moreover, you can try to access the database over http://www.nexis.com/api/version1/