Ldap server connection is aborted and closed, while it should unbind and close after #bind or #search

[Abhijit Chavan]

After doing #search, the same api close ldap server connection. But by looking at the server logs the connection is not getting closed properly, it is showing "closing from ip-address:51646 - A1 - Client aborted connection -". By looking at #close method which is used internally looks like it only closed socket connection and not sending any "unbind" request to ldap server.

Version of net-ldap gem: 0.12.0
LDAP server version: 2

Queries, connection information:
ldap = Net::LDAP.new
ldap.host = 
ldap.port = 
ldap.auth(user, password)
ldap.search(base: base_string)

Output:
[04/Apr/2017:12:55:46 -0400] conn=2063075 op=-1 msgId=-1 - fd=8023 slot=8023 LDAP connection from ip-address:51646 to ip-address
[04/Apr/2017:12:55:46 -0400] conn=2063075 op=0 msgId=1 - BIND dn="" method=128 version=3
[04/Apr/2017:12:55:46 -0400] conn=2063075 op=0 msgId=1 - RESULT err=0 tag=97 nentries=0 etime=0 dn=""
[04/Apr/2017:12:55:46 -0400] conn=2063075 op=1 msgId=0 - RESULT err=0 tag=120 nentries=0 etime=0
[04/Apr/2017:12:55:46 -0400] conn=2063075 op=-1 msgId=-1 - closing from ip-address:51646 - A1 - Client aborted connection -
[04/Apr/2017:12:55:46 -0400] conn=2063075 op=-1 msgId=-1 - closed.

[Abhijit Chavan]

Is there any reason behind this to close socket and not to call unbind api call?
If anybody has idea about how to implement this, then it will be appreciated

I have tried following from irb to make "unbind" call to ldap server
=======================================================================

require 'socket'

require 'net/ber'

require 'net/ldap/pdu'

require 'net/ldap/filter'

require 'net/ldap/dataset'

require 'net/ldap/password'

require 'net/ldap/entry'

require 'net/ldap/version'

@host = 'ldap host'

@port = 'port'

user, psw = ['CN=abc,CN=Users,DC=something,DC=local', 'abc']

@conn = TCPSocket.new(@host, @port)

--- bind ---------

msgid = 1.to_ber

request = [3.to_ber, user.to_ber, psw.to_ber_contextspecific(0)].to_ber_appsequence(0)

request_pkt = [msgid, request].to_ber_sequence

@conn.write request_pkt

-----------------

-----unbind-------

msgid = 2.to_ber

request_pkt = [msgid, Net::BER::Null.to_ber].to_ber_sequence

@conn.write request_pkt

------------------

bind call is successful, but I am not able to call unbind call successfully as mentioned in https://tools.ietf.org/html/rfc4511#section-4.3
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