Rclone doesn't close FTP connection when copy is completed

The associated forum post URL from https://forum.rclone.org

What is the problem you are having with rclone?

Rclone seems to not close the connection when is serving FTP, my client keeps the transfer window open for a few seconds after the transfer is completed and then says: CloseFile NO FD_CLOSE Response from Server

What is your rclone version (output from rclone version)

1.73.1

Which OS you are using and how many bits (e.g. Windows 7, 64 bit)

Windows 10, 64 bits

Which cloud storage system are you using? (e.g. Google Drive)

WebDAV

The command you were trying to run (e.g. rclone copy /tmp remote:tmp)

rclone serve ftp cardinal:

A log from the command with the -vv flag (e.g. output from rclone -vv copy /tmp remote:tmp)

2026/02/25 14:51:31 DEBUG : rclone: Version "v1.71.1" starting with parameters ["rclone" "serve" "ftp" "cardinal:" "-vv"]
2026/02/25 14:51:31 DEBUG : Creating backend with remote "cardinal:"
2026/02/25 14:51:31 DEBUG : Using config file from "C:\Users\Neto\AppData\Roaming\rclone\rclone.conf"
2026/02/25 14:51:31 DEBUG : found headers:
2026/02/25 14:51:31 INFO : webdav root '': poll-interval is not supported by this remote
2026/02/25 14:51:31 NOTICE: webdav root '': --vfs-cache-mode writes or full is recommended for this remote as it can't stream
2026/02/25 14:51:31 NOTICE: webdav root '': Serving FTP on localhost:2121
2026/02/25 14:51:31 INFO : : Rclone FTP Server listening on 2121

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Start by reproducing the issue through the rclone serve ftp entry point using the WebDAV remote and the client behavior described in the report. Trace the FTP transfer completion and connection-close path; done means the server closes the connection promptly after copying without the client's FD_CLOSE error.