[python-ldap] search_s call hangs (macos, python-ldap3.2). ldapsearch call is successful

[Balaji Jeevan]

I am having an issue with search_s call hanging indefinitely. Direct
ldapsearch call is working fine.
I have included the working ldapsearch and the failing python-ldap call.

I appreciate any pointers.
Thanks,
Balaji

$ python --version
Python 3.7.7

$ pip list | grep python-ldap
python-ldap        3.2.0

$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.14.6
BuildVersion: 18G4032

(Mojave)


LDAP version:
$ /usr/libexec/slapd -d3
5ec08515 @(#) $OpenLDAP: slapd 2.4.28 (Dec  3 2019 04:47:49) $
root at osx332.sd.apple.com:
/BuildRoot/Library/Caches/com.apple.xbs/Binaries/OpenLDAP/install/TempContent/Objects/servers/slapd
5ec08515 daemon: SLAP_SOCK_INIT: dtblsize=256
5ec08515 daemon_init: listen on ldap:///
5ec08515 daemon_init: 1 listeners to open...


Direct ldapsearch call works as expected:

$ ldapsearch -x -h ad-ldap.xxxxx.com -D "bjeevan at xxxxx.com" -w 'xxxxxx!' -b
"dc=xxxxx,dc=com" -s sub
'(&(objectCategory=person)(objectClass=user)(sAMAccountName=bjeevan)(!(userAccountControl:1.2.840.113556.1.4.803:=2)))'
cn
# extended LDIF
#
# LDAPv3
# base <dc=xxxxx,dc=com> with scope subtree
# filter:
(&(objectCategory=person)(objectClass=user)(sAMAccountName=bjeevan)(!(userAccountControl:1.2.840.113556.1.4.803:=2)))
# requesting: cn
#

# Balaji Jeevan, Users, Sunnyvale, xxxxx.com
dn: CN=Balaji Jeevan,OU=Users,OU=Sunnyvale,DC=xxxxx,DC=com
cn: Balaji Jeevan

Here is the hanging python-ldap call:
$ python
Python 3.7.7 (default, Mar 10 2020, 15:43:03)
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ldap
>>> con = ldap.initialize('ldap://ad-ldap.xxxxx.com:389')
>>> con.simple_bind_s( 'bjeevan at xxxxx.com', "yyyyy!" )
(97, [], 1, [])
>>> rt = con.search_s("dc=xxxxx,dc=com", ldap.SCOPE_SUBTREE,
'(sAMAccountName=bjeevan)', [])
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