SocketException on host over SmartPass VPN

I have ASP.NET code that attempts to access a particular database over a SmartPass VPN connection. After trying several different ways to avoid the "host not found" SocketException, I copied the ASPX page to a server inside the VPN -- the page worked with no problems. Then I copied the same code into a simple exe (console app); again, it worked fine. I'm at a loss of what the problem is. I know that the ASPX code has DnsPermission, etc., but I haven't been able to find any other clues via google, etc. If you have any ideas, please send them my way.