ProjectLink server not being recognized by supplier

Hello all!

We are use Windchill ProjectLink to share our CAD documents with our suppliers.  We are having issues where the supplier goes through the steps to register a new server and after they click "CHECK" nothing happens.  The server doesn't show up in server management dialogue box.

We are using Creo 2.0 our supplier is using Creo 3.0 and I believe we are using the same version of Windchill.  Is there a server compatibility issue here?  Any thoughts on avenues to explore to remedy this problem?

Thanks!