Since Deluge 1.3.10 the SSL protocol is updated to TLSv1 instead of SSLv3. This resulted in CP not being able to add new torrents. Link to change in Deluge: http://git.deluge-torrent.org/deluge/commit/?h=1.3-stable&id=26f5be17609a8312c4ba06aa120ed208cd7876f2