Canon EOS 5D Mark IV Instruction Manual page 156

Responding to Error Messages
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.
42: FTP server rejected connection
What to check on the FTP server
Is the FTP server configured to restrict access to only some

IP addresses?
Check the camera's IP address in [Confirm set.] (p.141), then

change the FTP server settings.
43: Cannot connect to FTP server. Error code received
from server.
What to check on the FTP server
Have you connected to more FTP servers than the maximum

number of FTP server connections?
Disconnect some network devices from the FTP server or increase

the maximum number of connections in the FTP server settings.
44: Cannot disconnect FTP server. Error code received
from server.
This error is displayed if the camera fails to disconnect from

the FTP server for some reason.
Turn off and on the FTP server and camera.

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