If your player is on 192.168.123.117, then what is the IP address of your PC?

It should be 192.168.123.something so you're on the same subnet. If not, then make sure that your PC and the player are on the same subnet.

Another possibility is that you are using a proxy or firewall of some kind. If that's the case, you need to tell IE to skip the proxy for local addresses and perhaps even specify all 192.168.123.* addresses should be skipped.