Sony STR-ZA810ES Manual page 202

Wait for a few moments after you have turned on the receiver, and then select the [Network
Settings] menu again.
[272] Troubleshooting
Cannot connect to the network.
Make sure the router or the wireless LAN router/access point is turned on.
The network settings on the receiver may be incorrect.
If the connection failed, set up the network connection again.
Confirm that the receiver is connected to the router or the wireless LAN router/access point
correctly.
If the receiver is connected to a wireless network, move the receiver and the wireless LAN
router/access point closer to each other.
If you have initialized the receiver or performed a system recovery on your server, perform
the network settings again.
[273] Troubleshooting
A server does not appear in the server list. (A message
that indicates that the receiver cannot find the server
appears on the TV screen.)
You may have turned on this receiver before you turned on the server. Refresh the server
list.
Make sure that the router or the wireless LAN router/access point is turned on.
The server may require some settings to accept the connection from the receiver. Confirm
that the server has been configured correctly. Confirm that the receiver is allowed to receive
music streamed from the server.
Confirm that the receiver and the server are connected to the router or the wireless LAN
router/access point correctly. Check the network settings information.
Refer to the operating instructions of your router or wireless LAN router/access point and
check the multicast setting. Try turning the multicast setting on or off on the wireless LAN
router/access point.
If your server is a software application on your PC, check the firewall setup and the security
software settings.
[274] Troubleshooting
Cannot access to the server, etc., connected to the
router via a wireless LAN connection.
If connecting the receiver to the router via a wireless LAN connection, you may not access
Home network
Home network
Home network