Yamaha RX-V779 Owner's Manual page 131

Problem
Wireless network is not found.
The unit does not detect the PC.
The files in the PC cannot be viewed or played
back.
The Internet radio cannot be played.
The iPod does not recognize the unit when using
AirPlay.
The application for smartphone/tablet "AV
CONTROLLER" does not detect the unit.
Firmware update via the network is failed.
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).
The media sharing setting is not correct.
Some security software installed on your PC is blocking the access
of the unit to your PC.
The unit and PC are not in the same network.
The MAC address filter is enabled on the unit.
The files are not supported by the unit or the media server.
The selected Internet radio station is currently not available.
The selected Internet radio station is currently broadcasting
silence.
Access to the network is restricted by the firewall settings of your
network devices (such as the router).
The unit is connected to a multiple SSID router.
The unit and smartphone/tablet are not in the same network.
The MAC address filter is enabled on the unit.
It may not be possible depending on the condition of the network.
En
Remedy
Turn off these devices.
Check the firewall setting of the wireless router (access point).
Configure the sharing setting and select the unit as a device to which music
contents are shared (p.73).
Check the settings of security software installed on your PC.
Check the network connections and your router settings, and then connect the
unit and the PC to the same network.
In "MAC Address Filter" in the "Setup" menu, disable the MAC address filter or
specify the MAC address of your PC to allow it to access to the unit (p.112).
Use the file format supported by both the unit and the media server. For
information about the file formats supported by the unit, see "Playing back music
stored on media servers (PCs/NAS)" (p.73).
There may be a network problem at the radio station, or the service may have
been stopped. Try the station later or select another station.
Some Internet radio stations broadcast silence at certain of times of the day. Try
the station later or select another station.
Check the firewall settings of your network devices. The Internet radio can be
played only when it passes through the port designated by each radio station.
The port number varies depending on the radio station.
Access to the unit might be restricted by the network separation function on the
router. Connect the iPod to the SSID which can access the unit.
Check the network connections and your router settings, and then connect the
unit and smartphone/tablet to the same network.
In "MAC Address Filter" in the "Setup" menu, disable the MAC address filter or
specify the MAC address of your smartphone/tablet to allow it to access to the
unit (p.112).
Update the firmware via the network again or use a USB memory device (p.122).
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