For those struggling with that error on that Blu-ray player...
Select Custom wireless network configuration, with:
IP Address something which no other device on your wireless network will have, say 192.168.1.111 (fiddle with the last number; try a random number between 150 and 254).
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1
Primary DNS: 126.96.36.199 (Google's)
Secondary DNS: 188.8.131.52
Apply those numbers. If it doesn't take, wait a couple minutes and try again.
Worked for me.