User is unable to get license on his machine for Math CAD 15

I am on a Honeywell support team and a user cannot get a license for MathCad 15 after putting in the license and port info. Other users have a license. Our local help desk cannot figure out the issue on his local machine. The license server has been checked. We are out of options to help this user get his work done.

I should add that other users have had this issue but it is resolved by entering the server and port information. That has worked in the past for this user as well but not this time.  Also, in the past it started working for him after a few days without changing anything.