Hi Greg,
Welcome to the forum! I don't have a Yamaha receiver that uses that software, but I've looked up some information and will try to help.
It says that it supports Windows XP, Vista, or 7. I'm going to assume that you're using one of those unless you say otherwise.
The manual for the software mentions using TCP on port 80. You'll want to make sure that Windows is set up to allow the software to go through the firewall, and that your wireless router (if applicable) is set up to allow traffic through port 80.
Although it's probably not the issue, there was a firmware update (v. 3.16) released last month. If you didn't get it, you might see if that helps.
I'll keep reading and see if I find anything else.
Adam