The studio license you have installed on the server is designed for developing purposes. It includes a max 5 concurrent sessions so you can do basic testing during develoment. You will need a server license to have it work on a (test) server as 5 concurrent sessions really isn't a lot.

If you're from Europe, just give us a call or send an email.
http://www.dataaccess.eu/Normal.asp?pageid=770