Canon EOS R5C Advanced User's Manual page 224

Troubleshooting
Unable to log in to FTP server. Error code returned.
- Check the FTP server's [User Name] and [Password] in the camera's network settings.
- Change the file access permission settings on the FTP server to allow reading, writing and accessing logs.
- Change the destination folder so the path includes only ASCII characters.
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Wi-Fi authentication unsuccessful
- The camera's authentication mode and/or encryption key are different from those of the access point. Change the
settings on the camera to match the access point.
Wi-Fi connection lost.
- The camera could not connect to the access point or network device.
- The wireless signal may be affected by nearby cordless telephones, microwave ovens, refrigerators or other devices.
Operate the camera in a place more distant from such interference.
Wi-Fi error. Incorrect encryption method.
- Make sure the camera and access point are using the same authentication/encryption method.