Sorry about the English but I don't speak Russian.
- The released version of zentyal-ftp need that you have activated the 'Enable PAM option' in 'Users and Groups' -> LDAP Settings . This makes the users to be able to login in the system like a regular unix user.
- In the git master branch we have fixed this, so it is not longer required. The next version of zentyal-ftp will include this code.