Network Function - Onkyo TX-NR545 Manual

Troubleshooting
Network function
"Network Setup" becomes selectable after the network starts up even if it
cannot be selected first. It may take about a minute to start up.
When NET is blinking, the AV receiver is not properly connected to the
home network.
Try unplugging the power supply of this unit and the router, and then
plugging in again. Try rebooting the router.
If the above does not solve the problem, check the following.
Cannot access the Internet radio
Cannot access the network server
Playback stops while listening to music files on the network server