I have discovered that the puppy firewall is thorough.
When it is ON it blocks the Chromecast device and my Google Chrome cannot see it.
When i disable the Firewall it of course sees the device. But I don't wish to turn off everything.
So, if I find the ports of access that the Google Chromecast device prefers, can I specifically open up those ports in the firewall? And if so how do I tell the firewall to do that?