No matter what I try I can't seem to get my probes to link.

I'm using the correct build of Phidgets that matches the current roastmaster release. Serial number, port, and webservice are all correct and running.

Is there anything else that could be causing them not to link?

I've restarted, I've uninstalled, re-installed. I have tried everything in all the support or how to forums. I'm just stuck, it doesn't link at all.