Can't close connection used for pool creation in LDAP JAVA SDK 4.17

Hi,

    In my app I need to create an LDAPv3 connections pool. As default 
protocol version is 2 I have to create the pool creating a connection 
setting the version to 3 and use that connection to create the pool. 
This works fine.

    The problem is when the application want to destroy the pool. I can 
actually destroy the pool and all its connections get closed but I can't 
disconnect the first connection created to set the protocol version...I 
call disconnect() method and don't get any exception but the connection 
remains open.

    I have tried to close the connection just after create the pool with 
the same results. Any idea?

Thanks in advance,

Carlos.