!!! Problem with grant PROXY USER - mysql 5.6.17 !!!

[Bartosz Rumiak]

Hi,

I have problem with grant user:

when I run
GRANT PROXY ON 'proftpd'@'localhost' TO ''@'';
I have error ERROR 1698 (28000): Access denied for user 'root'@'xxx-xxx02.xx.xxxx.xx'

show grant for user root
+--------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@% |
+--------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY PASSWORD '*D6AC92A952B1901A77164FE7577E9C46FC740A0C' WITH GRANT OPTION |
+--------------------------------------------------------------------------------------------------------------------------------+

mysql version 5.6.17-log

Help