Yamaha RX-V577 Owner's Manual page 105

Problem
(RX-V577 only)
Wireless network is not found.
Cause
Microwave ovens or other wireless devices in your neighborhood
might disturb the wireless communication.
Access to the network is restricted by the firewall settings of the
wireless router (access point).
Remedy
Turn off these devices.
Check the firewall setting of the wireless router (access point).
APPENDIX ➤ Troubleshooting
105
En