Canon EOS 5D Mark IV Instruction Manual page 154

Responding to Error Messages
41: Cannot connect to FTP server
What to check on the camera
On the camera, does the FTP server's IP address setting

match the server's actual address?
Configure the IP address on the camera to match the actual FTP

server address (p.76).
Are the camera and the access point set to use the same

encryption key for authentication?
This error occurs if the encryption keys do not match when the

authentication method for encryption is set to [Open system].
The setting is case-sensitive, so check upper- and lower-case
characters. Make sure that the correct encryption key for
authentication is entered on the camera (p.71).
On the camera, does the [Port number setting] for the FTP

server match the actual port number of the FTP server?
Configure the same port number (usually 21) on the camera and

FTP server. Configure the port number on the camera to match the
actual FTP server port number (p.77).
Are the camera's FTP server settings correctly entered on the

DNS server?
Make sure the FTP server's [Server name] is correctly entered on

the DNS server. Make sure the [Server name] for the FTP server
is correctly entered on the camera (p.76).
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