Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 486)

486
Responding to Error Messages
22: No response from DNS server
What to check on the camera
 On the camera, does the DNS server’s IP address setting match the
server’s actual address?
g Set the IP address to [Manual setting] . Then, on the camera, set
the IP address that matches the address of the DNS server used
( = 497, = 462).
What to check on the DNS server

Is the power of the DNS server on?
g
Turn on the DNS server.

Are the DNS server settings for IP addresses and the corresponding
names correct?
g
On the DNS server, make sure IP addresses and the corresponding
names are entered correctly.

Is the DNS server working correctly?
g
Check the DNS server settings to make sure it is working correctly
as a DNS server.
g
If applicable, ask your network administrator to ensure the DNS
server is available.
What to check on the network as a whole

Does the network that you are trying to connect to via Wi-Fi include a
router or similar device that serves as a gateway?
g
If applicable, ask your network administrator for the network gateway
address and enter it on the camera ( = 497, = 462).
g
Make sure that the gateway address setting is correctly entered on
all network devices including the camera.