Use the ladp plugin is very slow

[edwar...@gmail.com]

version of sonar: 6.7.4 LTE
ldap plugin version: 2.2

server : Windows 2012 R2 standard
When using the often can appear the following symptoms of the log

As shown in picture, I from the beginning of the log in action, to succeed you need to use the about 2 minutes, but sometimes will be less than 1 second