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
Is another device on the camera network using the same IP 
address as the camera?
Change the camera’s IP address to avoid using the same address 
as another device on the network. Otherwise, change the IP 
address of the device that has a duplicate address.
If the camera’s IP address is set to [Manual setting] in network 
environments using a DHCP server, change the setting to [Auto 
setting
] (p.72).
What to check on the camera
The camera’s proxy server setting is set to [Enable]. Is this the 
correct setting?
If no proxy server is used, set the proxy server setting to [Disable
(p.77).
Do the camera’s [Address setting] and [Port No.] settings 
match those of the proxy server?
Configure the camera’s proxy server address and port number to 
match those of the proxy server (p.77).
Are the camera’s proxy server settings correctly entered on 
the DNS server?
Make sure the proxy server’s [Address] is correctly entered on the 
DNS server.
23:  Device with same IP address exists on selected 
network
24:  No response from proxy server