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Re: Deletion of file hangs and cannot be cancelled

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Deletion of file hangs and cannot be cancelled

Just caught a bug with WinSCP 5.13.4, which perhaps would be not easy to reproduce.
I have started the file deletion and WinSCP rendered unresponsive, because it didn't react on "Close" of deletion dialog (see attachment) and this dialog captured the mouse input. I had to kill WinSCP with Task Manager. Log:
< 2018-09-06 00:03:08.813 226 Transfer complete

. 2018-09-06 00:03:08.813 Directory listing successful
. 2018-09-06 00:03:08.880 Startup conversation with host finished.
. 2018-09-06 00:24:18.303 Deleting file "comments.txt".
> 2018-09-06 00:24:18.312 DELE /ftp/comments.txt
. 2018-09-06 00:24:18.312 Unable to send command. Disconnected.

WinSCP hangs with similar symptoms (not able to close application) also when trying to refresh the directory contents:
. 2018-09-06 23:13:31.339 Directory content loaded from cache.

. 2018-09-06 23:13:36.272 Changing directory to "backup".
. 2018-09-06 23:13:36.274 Synchronizing current directory "/ftp/attic".
> 2018-09-06 23:13:36.277 CWD /ftp/attic
. 2018-09-06 23:13:36.277 Unable to send command. Disconnected.

I suspect that this happened because I have switched off sending keepalive commands (Advanced Site Settings → Connection → Keepalives = Off). I will keep watching...