Error 501 when connecting to Transmission Remote

[avberk]

I started a download and I then rebooted. Found that the torrent was removed? How can i prevent this?

Can you tell in which folder your torrent(s) are stored?

If it is not on /tmp/harddisk/torrent/torrents, then that's the problem.
Maybe you need to put the correct folder in settings.json manually.

Second thing you might want to try:

Stop the torrents before you reboot.

Hope this helps..