If Transfer cannot start because UDP port 69 is already in use, it’s likely another server application for TFTP, such as the macOS’s built-in TFTP server, is enabled or already running.
To stop, and permanently disable, the macOS’s built-in TFTP server, you will need admin privileges. Open Terminal and run the following two commands:
sudo launchctl stop com.apple.tftpd
sudo launchctl unload -F /System/Library/LaunchDaemons/tftp.plist
You can launch Transfer again. If the problem continues, a different server application may be using UDP port 69 and you need to stop it before using Transfer.
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