Canon EOS 5D Mark IV L-series Zoom Lens Kit オーナーマニュアル

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Responding to Error Messages
What to check on the camera
On the camera, does the DNS server’s IP address setting 
match the server’s actual address?
Set the IP address to [Manual setting]. Then, on the camera, set 
the IP address that matches the address of the DNS server used 
(p.168, 174).
What to check on the DNS server
Is the power of the DNS server on?
Turn on the DNS server.
Are the DNS server settings for IP addresses and the 
corresponding names correct?
On the DNS server, make sure IP addresses and the 
corresponding names are entered correctly.
Is the DNS server working correctly?
Check the DNS server settings to make sure the server is working 
correctly as a DNS server.
If applicable, ask your network administrator to ensure the DNS 
server is available.
What to check on the network as a whole
Does your network include a router or similar device that 
serves as a gateway?
If applicable, ask your network administrator for the network 
gateway address and enter it on the camera (p.168, 174).
Make sure that the gateway address setting is correctly entered on 
all network devices including the camera.
22:  No response from DNS server